The interface speaks Slovak

969 strings, an instance default and a per-person choice, and no half-done corner:
the admin prose is translated too. Design and reasoning: LLeMbas.wiki/Translations.

KEYED BY THE ENGLISH SENTENCE

A missing entry renders the key, which is the English -- so an untranslated string
looks as it always did, an English instance is byte-for-byte 1.6.0, and a
half-finished catalogue is a half-translated page rather than a page of dotted key
names. The cost is that editing an English sentence orphans its translation
silently, which is what tests/test_translations.py asserts in both directions.

No gettext: .po -> .mo is a build step and this project does not have one.

A JINJA GLOBAL, AND THEREFORE A CONTEXTVAR

`t()` is a global for the reason `brand` already documents -- render() is bypassed
by 25 TemplateResponse calls and 8 get_template().render() calls, the latter being
the SSE frames, which have no Request at all. A global is bound once at import and
the language is per person, so the active language is a ContextVar set per request.

🚨 `get_current_user` had to become `async def`. FastAPI runs a sync dependency in a
threadpool, and anyio copies the context in and discards it on the way out -- so
the language was set where nothing could see it and every page rendered in the
instance's language whatever anybody had chosen, with no error anywhere.

NOT TRANSLATED, ON PURPOSE

Everything a model reads: the 60 prompt fragments, and the dates in harness.py,
schedule/runner.py and schedule/compile.py. Only `i18n.stamp` is localised, and
only where a person reads it -- with the *format* translatable as well as the
words, because "26. septembra 2026" is a different pattern rather than the same one
with different words in it. A process locale is not an option: global, not
thread-safe, two people's pages at once.

A second fragment telling models to answer in the reader's language was written
during this work and removed: `core.style` has said it since long before, and
test_an_empty_override_turns_a_fragment_off caught the duplicate.

THE BULK PASS

1213 sites wrapped by a one-off script that only touched patterns it could not
misread. It got three wrong in a way that mattered -- `t('…')` inside `attr="…"`
where the sentence held an apostrophe, closing the Jinja string and 500ing two
pages whose partials no test renders. tests/test_translations.py now compiles all
110 templates. It also wrapped the product's own name, an SSH key header, a
keystroke hint and an example URL, all taken back out: a string is not
translatable just because it is a string.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/lembas/api/admin.py

@@ -16,6 +16,7 @@ from lembas.db.models import Connection, Model, User
 from lembas.services import settings_store
 from lembas.services.crypto import UNCHANGED_SENTINEL, decrypt, encrypt, mask
 from lembas.services.llm.openai_client import Endpoint, LLMError, context_from, list_models
+from lembas.web import i18n
 from lembas.web.templating import render
 
 log = logging.getLogger(__name__)
@@ -46,6 +47,7 @@ async def general_page(request: Request, db: Db, user: AdminUser, saved: bool =
         "admin/general.html",
         {
             "values": settings_store.get_group(db),
+            "languages": i18n.LANGUAGES,
             "saved": saved,
             "user_count": db.scalar(select(func.count()).select_from(User)),
         },
@@ -57,6 +59,7 @@ async def save_general(
     db: Db,
     user: AdminUser,
     allow_signup: bool = Form(False),
+    language: str = Form(""),
     system_prompt: str = Form(""),
     compact_threshold: int = Form(95),
     max_chat_rounds: int = Form(5),
@@ -70,6 +73,9 @@ async def save_general(
         db,
         {
             "allow_signup": allow_signup,
+            # Validated rather than trusted: a code this release does not have
+            # would leave every page in a language nobody chose.
+            "language": i18n.known(language),
             "system_prompt": system_prompt.strip()[:8000],
             # 0 is "never"; anything else is clamped into a band where it can
             # do some good. 100 is useless -- you cannot compact after
@@ -82,6 +88,9 @@ async def save_general(
             "max_chat_rounds": min(max(max_chat_rounds, 0), 100),
         },
     )
+    # The instance default is cached at process level, exactly as branding is, so
+    # the one module that writes it is the one that drops the cache.
+    i18n.forget()
     log.info("registration %s by %s", "opened" if allow_signup else "closed", user.email)
     return RedirectResponse("/admin/general?saved=1", status_code=status.HTTP_303_SEE_OTHER)