localize-sl

Translate to Slovenian (sl) — High-Fidelity Skill

Scope & Variants

Slovenian is a single standard target — Modern Standard Slovenian (knjižna slovenščina). No regional split for product UI:

Locale	Notes
`sl` / `sl-SI`	Standard Slovenian (Slovenia). Default and only target.

Practical reality: Slovenian translation has one target. The defining quality concern is the dual number — a feature unique to Slovenian among major modern European languages (Sorbian also has it but is much smaller). Failing to use dual is the most-mocked Slovenian translation error.

Slovenian is its own South Slavic language

Slovenian is mutually intelligible with Croatian and Serbian to some degree but is structurally distinct. Don't conflate them. Key distinguishing features:

Dual number (Slovenian has it; Croatian/Serbian don't — they merged dual into plural).
Different vocabulary: datoteka (sl/hr/sr same), mapa (sl/hr same — sr uses fascikla/folder), but okno (sl) vs prozor (hr/sr) for "window".
prihrniti vs Croatian spremiti for "save" — Slovenian uses shraniti.
Slovenian doesn't have ekavian/ijekavian distinction — it has its own yat reflexes.

Register Auto-Detection (Apply Before Translating)

Slovenian has a strong T-V distinction (Vi/ti — called "vikanje" vs "tikanje"). Auto-detect from source:

Source signal	Target register
Casual / conversational / personal (`Hey!`, contractions, emoji, marketing voice, gaming)	Informal (ti / tikanje) — `ti` lowercase, 2nd-person sg. verb endings (`-š`: lahko, vidiš), familiar imperative (singular: izberi, klikni, odpri).
Neutral product UI / docs / consumer software (DEFAULT)	Formal (Vi / vikanje) — `Vi` capitalized for direct address, 2nd-person pl. verb endings (`-te`: lahko, vidite), polite imperative (`-te/-ite`: izberite, kliknite, odprite). Possessive `Vaš/Vaša/Vaše` capitalized.
Legal / banking / government / enterprise	Formal (Vi) elevated — same `Vi` form but full constructions, no contractions, prefer impersonal `se` constructions, native Slovenian vocabulary.

Hard rule: never mix levels in one text. A string with Lahko spremenite (formal verb) and tvoje nastavitve (informal possessive) is broken.

Capitalization rule for Vi: Vi / Vaš / Vaša / Vaše / Vam / Vas are capitalized in direct second-person address.

Default for software UI: Vi (vikanje, formal) unless brand voice is explicitly youth/casual.

Critical Hard Rules (Severity ≥ 2.0 — Auto-Fail If Wrong)

1. DUAL NUMBER — exactly 2 items takes a separate grammatical number (severity 3.0)

THE DEFINING FEATURE OF SLOVENIAN. Slovenian is one of the very few modern Indo-European languages that actively preserves the dual as a productive grammatical number distinct from plural.

For exactly 2 of anything: noun, adjective, verb auxiliary, pronoun, and past participle ALL take dedicated dual forms.

Number	Form (with "datoteka" — file, fem.)	Adj. + Noun	Verb (past)
1 (singular)	datoteka	nova datoteka	je delala
2 (DUAL)	datoteki	novi datoteki	sta delali
3, 4 (plural)	datoteke	nove datoteke	so delale
5+ (gen.pl.)	datotek	novih datotek	so delale

Same for masculine:

Number	"sistem" (m.)	Adj. + Noun	Verb (past)
1	sistem	nov sistem	je deloval
2	sistema	nova sistema	sta delovala
3-4	sistemi	novi sistemi	so delovali
5+	sistemov	novih sistemov	so delovali

And neuter:

Number	"okno" (n.)	Adj. + Noun	Verb (past)
1	okno	novo okno	je delovalo
2	okni	novi okni	sta delovali
3-4	okna	nova okna	so delovala
5+	oken	novih oken	so delovala

Critical UI examples:

✗ Wrong (treating 2 as plural)	✓ Correct (using dual)	English
2 datoteke	2 datoteki	2 files
2 sistemi	2 sistema	2 systems
2 sporočila	2 sporočili	2 messages (neuter dual)
dva nova računalniki	dva nova računalnika	two new computers
dve novi datoteke	dve novi datoteki	two new files
so delali (for 2 people)	sta delala (or `sta delali` if fem.)	they (two) worked

2. Word integrity — verb prefixes NEVER split (severity 3.0)

Slovenian verbs with prefixes are single words. Splitting them is a critical error.

✗ Wrong (split)	✓ Correct (joined)
`pre vesti`	`prevesti` (to translate)
`iz vesti`	`izvesti` (to execute)
`na ložiti`	`naložiti` (to upload / load)
`od dati`	`oddati` (to submit)
`pri javiti se`	`prijaviti se` (to log in)
`pre nesti`	`prenesti` (to download / transfer)
`za pisati`	`zapisati` (to write)

Reflexive se / si is SEPARATE clitic — not attached to verb in writing. prijaviti se, zaregistrirati se, nahajati se. Writing prijavitise is wrong.

3. Six-case system (severity 2.5)

Slovenian uses 6 cases (same as Slovak — no separate vocative; direct address uses nominative).

Case	Question	Use	Example (m. "uporabnik")	Example (f. "aplikacija")
Imenovalnik (NOM)	kdo? kaj?	Subject (and direct address)	uporabnik	aplikacija
Rodilnik (GEN)	koga? česa?	Possession, "of", absence, 5+ count	uporabnika	aplikacije
Dajalnik (DAT)	komu? čemu?	Indirect object, "to"	uporabniku	aplikaciji
Tožilnik (ACC)	koga? kaj?	Direct object	uporabnika (animate=GEN) / sistem (inanimate=NOM)	aplikacijo
Mestnik (MES)	o kom? čem?	Location (always w/ prep)	o uporabniku	o aplikaciji
Orodnik (ORO)	s kom? čim?	"With", means	z uporabnikom	z aplikacijo

Critical: animate masculine accusative = genitive form. vidim uporabnika, NOT vidim uporabnik.

4. Preposition + governed case (severity 2.5)

Preposition	Case	Example
v (in/into)	MES (location) / ACC (motion)	v sistemu / v sistem
na (on/onto)	MES / ACC	na zaslonu / na zaslon
z / s (with)	ORO	z uporabnikom, s sistemom
brez (without)	GEN	brez napak
za (for)	ACC	za uporabnika
od (from)	GEN	od uporabnika
do (until/to)	GEN	do konca
o (about)	MES	o uporabniku
po (after / per / along)	MES (after) / DAT (rate)	po prijavi / na datoteko (per file)
pred (before)	ORO / ACC	pred shranjevanjem / pred sistem
pri (at, near)	MES	pri shranjevanju
med (between, during)	ORO / ACC	med datotekami
k (to/toward)	DAT	k uporabniku

"per" in Slovenian: use na + ACC (na datoteko, na uporabnika), dnevno for "per day".

5. ICU plurals — one / two / few / other (severity 3.0)

Slovenian's ICU plural categories are unique because they include the two category for the dual:

{count, plural,
  one {# datoteka}
  two {# datoteki}
  few {# datoteke}
  other {# datotek}
}

CLDR plural category boundaries:

Category	Rule	Examples	Noun form
`one`	n % 100 = 1	1, 101, 201, 301	NOM singular (datoteka)
`two`	n % 100 = 2	2, 102, 202, 302	DUAL (datoteki)
`few`	n % 100 ∈ {3, 4}	3, 4, 103, 104	NOM plural (datoteke)
`other`	everything else	0, 5-100, 105+	GEN plural (datotek)

Critical: ICU MUST include the two category for Slovenian. Falling back to just one/other (English-style) is a critical error — speakers will immediately notice the missing dual.

6. Numeral-noun agreement (severity 2.5)

Count	Pattern	Example
1	NOM sg	1 datoteka, 1 sistem
2	DUAL	2 datoteki, 2 sistema, 2 okni
3, 4	NOM pl	3 datoteke, 4 sistemi
5+	GEN pl	5 datotek, 10 sistemov
0	GEN pl	0 datotek
101	NOM sg (back to "one")	101 datoteka
102	DUAL (back to "two")	102 datoteki

7. Three-gender adjective agreement (severity 2.0)

Gender	Example	Adjective NOM sg.
Masculine (consonant ending)	sistem, uporabnik, računalnik	nov sistem (NO `-i` ending on indefinite!)
Feminine (-a ending)	aplikacija, mapa	nova aplikacija
Neuter (-o/-e ending)	okno, sporočilo	novo okno

Note vs other Slavic: Slovenian masculine indefinite adjective is nov (bare consonant ending) — NOT novi. The -i ending marks definite (only in certain syntactic positions). This is a Slovenian-specific feature different from Croatian/Serbian/Czech/Slovak.

✗ Wrong	✓ Correct
novi sistem (when indefinite)	nov sistem (a new system)
novi uporabnik (when indefinite)	nov uporabnik
nova okno	novo okno
nov aplikacija	nova aplikacija

8. Past-tense gender + number agreement (severity 2.0)

Past participles agree with subject in gender AND number (INCLUDING dual!):

Subject	L-participle	Example
m. sg.	-l	on je delal
f. sg.	-la	ona je delala
n. sg.	-lo	ono je delalo
m. dual	-la	onadva sta delala
f. dual	-li	onidve sta delali
n. dual	-li	onidve sta delali (neuter dual takes f.-dual form in modern Slovenian)
m. pl.	-li	oni so delali
f. pl.	-le	one so delale
n. pl.	-la	ona so delala

Dual forms with auxiliary sta (for 2 people) — NOT so (which is plural for 3+).

9. Verb aspect — perfective vs imperfective (severity 2.0)

Imperfective (process, ongoing)	Perfective (single completed event)	English
shranjevati	shraniti	save
brisati	izbrisati	delete
nalagati	naložiti	upload / load
prenašati	prenesti	download / transfer
odpirati	odpreti	open
zapirati	zapreti	close
ustvarjati	ustvariti	create
urejati	urediti	edit
prevajati	prevesti	translate
prijavljati se	prijaviti se	log in

UI patterns by aspect:

Buttons (single action) → perfective imperative: Shrani, Izbriši, Pošlji, Izberi.
Ongoing status → imperfective verbal noun (Shranjevanje…, Nalaganje…) or reflexive imperfective (se shranjuje).
Completed → perfective neuter participle (Shranjeno, Naloženo).

10. Verb-construction integrity — no stacked finite verbs (severity 2.0)

English -ing (gerund as adverbial) MUST be rendered with deležje na -č (present adverbial participle: gradeč, delajoč, pišoč) OR med + verbal noun, NOT a second finite clause.

Note: the adverbial participle in modern Slovenian is somewhat literary; the med + verbal noun construction is more common in product copy.

✗ Stacked finite	✓ Adverbial participle / med + noun	English
`Preživel sem 6 let gradil sem podjetje`	`Preživel sem 6 let z gradnjo podjetja` OR `Preživel sem 6 let gradeč podjetje`	I spent 6 years building the business
`Delal sem medtem ko sem pisal poročilo`	`Delal sem med pisanjem poročila` OR `Delal sem pišoč poročilo`	I worked while writing the report

11. Diacritics — Č Š Ž essential (severity 2.5)

Slovenian uses three special letters: č š ž. Never strip them.

✗ Stripped	✓ Correct
sirina	širina
nacin	način
zelo	želo (or `zelo` = "very" — they're different words!)
krizisce	križišče
druzba	družba

Slovenian does NOT use ć / đ (those are Croatian/Serbian/Bosnian markers — if you see them in a Slovenian translation, something is wrong).

Pronouns and Possessives

Personal pronouns

English	Slovenian	Notes
I	jaz
you (sg. informal)	ti
you (sg./pl. formal — capitalize)	Vi	Always capitalized in direct address
you (pl. informal)	vi	lowercase when truly plural informal
he	on
she	ona
it	ono
we (two)	midva (m.) / midve (f.)	DUAL pronoun
you (two)	vidva (m.) / vidve (f.)	DUAL pronoun
they (two)	onadva (m.) / onidve (f.)	DUAL pronoun
we (3+)	mi
you (3+)	vi
they (m. 3+)	oni
they (f. 3+)	one
they (n. 3+)	ona

Possessive pronouns

Person	m. sg.	f. sg.	n. sg.
moj (my)	moj	moja	moje
tvoj (your sg.)	tvoj	tvoja	tvoje
Vaš (your formal — capitalize)	Vaš	Vaša	Vaše
njegov (his)	njegov	njegova	njegovo
njen (her)	njen	njena	njeno
svoj (reflexive — own)	svoj	svoja	svoje
naš (our)	naš	naša	naše
njihov (their)	njihov	njihova	njihovo

Reflexive svoj is required when possessor = subject of same clause.

UI Conventions

Buttons — perfective imperative

English	✓ Slovenian (Vi formal)	(ti informal)
Save	Shranite	Shrani
Cancel	Prekličite	Prekliči
Delete	Izbrišite	Izbriši
Send	Pošljite	Pošlji
Edit	Uredite	Uredi
Search	Iščite	Išči
Confirm	Potrdite	Potrdi
Continue	Nadaljujte	Nadaljuj
Submit	Pošljite / Oddajte	Pošlji / Oddaj
Sign in / Log in	Prijavite se	Prijavi se
Sign out	Odjavite se	Odjavi se
Sign up	Registrirajte se	Registriraj se
Next	Naprej / Naslednje	(same)
Back	Nazaj	(same)
Done	Končano / Opravljeno	(same)
OK	V redu / OK	(same)
Close	Zaprite	Zapri
Upload	Naložite	Naloži
Download	Prenesite	Prenesi
Refresh	Osvežite	Osveži
Settings	Nastavitve	(same)
Apply	Uporabite	Uporabi
Reset	Ponastavite	Ponastavi
Select all	Izberite vse	Izberi vse
Add more	Dodajte še (NOT `Dodaj več`)	Dodaj še

Status messages — three distinct patterns

Ongoing (in-flight) → verbal noun (Nalaganje…) OR reflexive imperfective (se nalaga…) OR Poteka + verbal noun (NEVER first-person)

English	✓ Slovenian
Loading…	Nalaganje… / Datoteka se nalaga… / Poteka nalaganje…
Saving…	Shranjevanje… / se shranjuje…
Sending…	Pošiljanje… / se pošilja…
Processing…	Obdelava… / se obdeluje… / Poteka obdelava…
Connecting…	Povezovanje…
Searching…	Iskanje… / se išče…
Translating…	Prevajanje… / Poteka prevod…
Please wait	Prosimo, počakajte / Počakajte…

Critical impersonal voice rule: NEVER first-person (Računam…, Analiziram…, Obdelujem…) — sounds awkward. Always impersonal.

Completed → Neuter perfective participle (impersonal)

English	✓ Slovenian
Saved	Shranjeno
Done	Končano / Opravljeno
Translation complete	Prevedeno / Prevod končan
File uploaded	Naloženo / Datoteka naložena
Sent	Poslano
Payment successful	Plačilo uspešno / Plačano

Failed → Ni uspelo + infinitive OR Napaka pri + verbal noun

English	✓ Slovenian
Save failed	Ni uspelo shraniti / Napaka pri shranjevanju
Upload failed	Ni uspelo naložiti / Napaka pri nalaganju
Translation failed	Ni uspelo prevesti / Napaka pri prevajanju
File not found	Datoteka ni najdena / Datoteka ne obstaja

NEVER use:

✗ Prevod ni uspel (sounds like "the translation didn't succeed" — flat narrative tone)
✗ Shranjevanje neuspešno (calque)

Empty states — `Ni X` / `Ni izbrano`

✗ Verbose / bare	✓ Concise
Prazno	Ni rezultatov / Ni najdenih elementov
Nič tukaj	Ni datotek / Ni razpoložljivih podatkov

Drag-and-drop

drag → povlecite (Vi) / povleci (ti)
drop → spustite (Vi) / spusti (ti)
Combined: Povlecite datoteke sem (Drag files here).

File picker — `Izberi` not `Prebrskaj`

Standard in Chrome SL / Windows SL:

✗ Older / navigation	✓ Modern / action-oriented
Prebrskaj datoteke	Izberi datoteke
Prebrskaj datoteko	Izberi datoteko
kliknite za brskanje	kliknite za izbiro

Quantity expressions

✗ Calque	✓ Native
25+ jezikov	več kot 25 jezikov
+{count} več	in {count} drugih / še {count}

Dodaj več ✗ → Dodaj še ✓ (idiomatic).

Error messages — what + next step

✗ Bare	✓ With next step
Datoteka ni najdena.	Datoteka ni najdena. Preverite pot.
Napaka omrežja.	Napaka omrežja. Poskusite znova.

Punctuation, Numbers, Dates, Currency

Punctuation

Mark	Slovenian	Notes
Question mark	`?`	Same as English
Comma	`,`	Different conjunction rules
Period	`.`	Same
Colon	`:`	Same
Quotation marks	`„…"` (low-9/high-9) OR `»…«` (French-style, inward)	Both standard in Slovenian
Nested quotes	`‚…'` or `›…‹`

Comma rules

Rule	Example
NO comma before `in` (and)	Izberite datoteko in kliknite.
NO comma before `ter` (and, formal)	hitro ter učinkovito.
NO comma before `ali` (or)	Izberite datoteko ali mapo.
NO comma before `pa` (but/and contrast)	(depends on emphasis)
Comma before `da` (that, subordinating)	Vidim, da je datoteka odprta.
Comma before `ki` (relative — non-restrictive)	Datoteka, ki je shranjena…
Comma before `če` (if)	Shranite, če želite.
Comma before `ker` (because)	Preklicano, ker ni uspelo.
Comma before `ko` (when)	Počakajte, ko bo končano.
Comma before `a / ampak / toda` (but/contrast)	Hitro, ampak učinkovito.

Numbers

Format	Pattern	Example
Thousands separator	period (.) OR space	1.234.567 OR 1 234 567
Decimal separator	comma (,)	3,14 / 99,99
Negative	`−25` or `-25`
Percent	`25 %` (with space) or `25%`

Dates

Format	Example	Use
D. M. YYYY	15. 1. 2024	Default — spaces around periods
D. mesec YYYY	15. januar 2024	Long-form prose (month NOT in genitive — unlike Croatian/Slovak)
YYYY-MM-DD	2024-01-15	Technical/API only

Slovenian month names (lowercase, declines in some forms):

#	Slovenian
1	januar
2	februar
3	marec
4	april
5	maj
6	junij
7	julij
8	avgust
9	september
10	oktober
11	november
12	december

Note: in Slovenian long-form dates, the month is in NOMINATIVE (15. januar 2024) — different from Croatian (genitive: 15. siječnja 2024) and Slovak (genitive: 15. januára 2024). The figure-only form uses periods with spaces (15. 1. 2024).

Weekdays (lowercase): ponedeljek, torek, sreda, četrtek, petek, sobota, nedelja.

Week starts Monday.

Time

24-hour preferred: 14:30 or 14.30.
12-hour rarely used.

Currency — Euro (EUR / €)

Format	Pattern	Example
Symbol after amount	`€`	99,99 €
ISO code	EUR	99,99 EUR

Slovenia adopted the euro on 1 January 2007 (previously: Slovenian tolar).

Terminology — preferred Slovenian terms

English	✓ Slovenian preferred	✗ Avoid
user	uporabnik	user
account	račun (banking) / uporabniški račun (account)	akaunt
password	geslo	password
settings	nastavitve	setingi
dashboard	nadzorna plošča	dashboard
email	e-pošta / e-poštni naslov	mejl
link	povezava	link
website	spletno mesto / spletna stran	website
folder	mapa	folder
file	datoteka	fajl
device	naprava	device
phone	telefon / mobilni telefon	—
computer	računalnik	kompjuter
application / app	aplikacija	—
update (v.)	posodobiti	apdejtovati
save	shraniti	sejvati
delete	izbrisati	deletovati
upload	naložiti	uploadati
download	prenesti	downloadati
sign in / log in	prijaviti se	logirati se
sign up	registrirati se	—
search	iskati / iskanje	search
click	klikniti / pritisniti	—
share	deliti	šerati
profile	profil	—
notifications	obvestila	notifikacije
privacy	zasebnost	—
terms	pogoji	—
support	podpora	—
help	pomoč	—
feedback	povratne informacije	—
menu	meni	—
home	domov / domača stran	—
browser	brskalnik	browser
screen	zaslon	—
keyboard	tipkovnica	—
mouse	miška	—
software	programska oprema	—
build (software)	ustvariti / zgraditi	graditi (= construction)
deploy	namestiti / objaviti	deployati
pipeline (CI/CD)	pipeline (keep)	—
commit (git)	commit (keep)	—
merge	združiti / spojiti	—
repository	repozitorij	—
sync	sinhronizirati	—
API	API (keep — Latin always)	—
endpoint	končna točka / endpoint	—
token	žeton / token	—
cache	predpomnilnik / cache	—
log (n.)	dnevnik / log	—

Tech identifiers — keep in Latin script

Inside Slovenian text (Latin alphabet anyway), these stay as-is:

Git, GitHub, Docker, npm, pip
HTTP, REST, GraphQL, OAuth, JWT
JSON, XML, YAML, CSV, PDF
Brand names: Google, Microsoft, Apple, iPhone, Android
Commands, paths, URLs, code, placeholders

False Friends — Critical

Slovenian word	Actually means	NOT this	Correct for the English
vznemirjen	agitated / disturbed (can be negative)	safer "excited"	"excited (looking forward)" → veselim se / navdušen
aktualen	current / topical	"actual"	"actual" → dejanski / resničen
realizirati	to implement / carry out	"to realize (understand)"	"realize" → spoznati / uvideti
eventualno	possibly / perhaps	"eventually"	"eventually" → končno / na koncu
kontrolirati	to check / verify	"to control (manage)"	"control" → upravljati / voditi
simpatičen	likeable / pleasant	"sympathetic (compassionate)"	"sympathetic" → sočuten

Calque / Anti-Pattern List

✗ Calque	✓ Native Slovenian	Reason
To naredi smisel	To je smiselno / To je logično	"Makes sense" calque
na koncu dneva	konec koncev / navsezadnje	"At the end of the day" calque
vzeti mesto	potekati / odvijati se	"Take place" calque
bazirano na	na podlagi / temelječ na	"Based on" calque
v redu da	da bi / zato da	"In order to" calque
na dnevni bazi	dnevno / vsak dan	"On a daily basis" calque
v smislu	glede / kar zadeva	"In terms of" calque (when overused)
Avto-zaznano	Samodejno zaznano	"Auto-X" — use full adverb `samodejno`
Avto-shranjeno	Samodejno shranjeno	"Auto-X"
Avto-popravek	Samodejni popravek	Use full adjective
Avto-dopolnjevanje	Samodejno dopolnjevanje	Use full adjective (neuter)
Prevedeni rezultati (header)	Rezultati prevajanja	English Past-Participle + Noun → Slovenian Noun + Genitive of verbal noun
Posodobljene nastavitve (header)	Nastavitve posodobitve / Spremembe nastavitev	Same pattern
Uvožene datoteke (header)	Datoteke uvoza / Uvoženi dokumenti	Same pattern
opcija jezika (N+N)	jezikovne možnosti / izbira jezika	Use adj+N or genitive
projekt mapa	mapa projekta / projektna mapa	Use genitive or adjective
uporabnik nastavitve	uporabniške nastavitve / nastavitve uporabnika	Use adj or genitive
preferenca tona	želeni ton / izbira tona	Anglicism noun → native adj
Nič izpadov / Nič napak	Brez izpadov / Brez napak	"Zero X" marketing calque
AI-poganjan	temelječ na AI / s pomočjo AI	"X-powered" calque
podatki-usmerjen	podatkovno usmerjen / temelječ na podatkih	"X-driven" calque
per datoteka	na datoteko	"per X" calque
per uporabnik	na uporabnika	"per X"
per dan	dnevno / na dan	"per X"
Prevod ni uspel	Ni uspelo prevesti / Napaka pri prevajanju	Personal "didn't succeed" → impersonal
Shranjevanje neuspešno	Ni uspelo shraniti / Napaka pri shranjevanju	Calque → impersonal
Datoteka se je shranila	Shranjeno / Datoteka shranjena	Reflexive past → impersonal participle
Prekliči izbiro vsega	Prekliči vse / Odznači vse	Button brevity
Izberi izbiro vseh	Izberi vse	Button brevity / redundancy
Dodaj več	Dodaj še	"Add more" — use idiomatic `še`
Združene države Amerike (UI)	ZDA	UI short form
2 datoteke (treating as plural)	2 datoteki (DUAL!)	THE Slovenian rule
so delali (for 2)	sta delala/delali (DUAL!)	THE Slovenian rule

Self-Check Checklist (Run Before Returning Output)

DUAL — auto-fail on miss (severity 3.0)

Every count of exactly 2 uses dual form on noun, adjective, AND verb auxiliary.
ICU plurals include two category (NOT just one/other or one/few/other).
Dual past tense: sta delala (m. dual) / sta delali (f. dual / n. dual) — NOT so delali (which is plural for 3+).
Dual adjective: dva nova računalnika (m.), dve novi datoteki (f.), dve novi okni (n.).
Dual pronouns: midva/midve (we two), vidva/vidve (you two), onadva/onidve (they two).

Accuracy

Word integrity — prefixes joined (prevesti, naložiti, odpreti, prijaviti). Reflexive se separate.
Six-case system correct (no separate vocative — direct address uses NOM).
Animate masc. accusative = genitive (vidim uporabnika).
Masculine indefinite adjective is bare: nov sistem (NOT novi sistem when indefinite).
Gender agreement on every noun-adj-verb triple.
ICU plurals: one / two / few / other (1 / 2 / 3-4 / 0+5+). All four categories present.
Numeral-noun: 1=NOM.sg, 2=DUAL, 3-4=NOM.pl, 5+=GEN.pl.
Verb aspect correct.
Past-tense gender + number agreement including dual.
No stacked finite verbs from English -ing — use med + verbal noun or -č participle.
Placeholders preserved.
Latin tech identifiers intact.
Numbers: comma decimal (3,14), period or space thousands (1.234), € after amount.
Dates: 15. 1. 2024 (spaces!) or 15. januar 2024 (month in nominative — unlike Croatian/Slovak).
Time: 24-hour.
per: na + ACC for rate, dnevno for "per day".
Diacritics: č š ž preserved. No ć / đ / dj (those are Croatian).

Register

Vi/ti chosen and applied consistently.
Vi / Vaš / Vaša / Vaše capitalized in direct address.

UI conventions

Buttons use perfective imperative (Vi Shranite or ti Shrani).
Status ongoing: verbal noun (Nalaganje…) OR reflexive se (se nalaga…) OR Poteka + noun. NEVER first-person.
Status completed: neuter perfective participle (Shranjeno, Prevedeno).
Status failed: Ni uspelo + infinitive OR Napaka pri + verbal noun.
Empty state: Ni + GEN (Ni rezultatov).
File picker: Izberi, not Prebrskaj.
Drag-drop: Povlecite + Spustite.
Quantity: več kot 25, še {count}.
Error messages include next step.

Naturalness

No English calques (To naredi smisel, na koncu dneva, vzeti mesto, bazirano na).
Past-Participle + Noun headers → Noun + Genitive of verbal noun (Rezultati prevajanja).
Auto-X prefix → full adverb Samodejno.
N+N compounds → adj+N or genitive.
No verbose collocations (use direct verbs).
No false friends: vznemirjen ≠ excited (positive), aktualen ≠ actual, realizirati ≠ realize, eventualno ≠ eventually.
Proper-noun short forms (ZDA, ZK).

Worked Example — Standard sl formal UI

Source (neutral product UI):

Welcome back! You have 3 new files in your account. Click Continue to review them or Cancel to stay here. Saving your changes…

Register check: neutral product UI → Vi (formal), perfective imperative buttons.

Translation:

Dobrodošli nazaj! V svojem računu imate 3 nove datoteke. Kliknite Nadaljuj, če jih želite pregledati, ali Prekliči, če želite ostati tukaj. Vaše spremembe se shranjujejo…

Why this works:

Dobrodošli nazaj — formal plural greeting.
V svojem računu — v + MES; računu masc. MES sg.; svojem reflexive possessive.
Imate — Vi-form verb.
3 nove datoteke — 3 triggers few (NOM pl); datoteka is f.; nove is f. pl. adjective. (If it were 2: 2 novi datoteki — DUAL.)
Buttons: Nadaljuj, Prekliči (perfective imperative, ti-form — for Vi alternative would be Nadaljujte, Prekličite).
če jih želite pregledati / če želite ostati — če + present (correct Slovenian construction).
Status: Vaše spremembe se shranjujejo… — imperfective reflexive (impersonal). Vaše capitalized formal. spremembe is f. pl., shranjujejo is 3rd-person plural reflexive.
Comma before če ✓; no comma before ali ✓.

Worked Example — DUAL in action

Source: 2 files saved. They (the two files) are uploaded.