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/deps.py

@@ -13,6 +13,7 @@ from starlette.requests import HTTPConnection
 from lembas.db.models import User
 from lembas.db.session import get_session_factory
 from lembas.security.sessions import COOKIE_NAME, resolve_session
+from lembas.web import i18n
 
 
 def get_db() -> Iterator[DBSession]:
@@ -27,9 +28,21 @@ def get_db() -> Iterator[DBSession]:
 Db = Annotated[DBSession, Depends(get_db)]
 
 
-def get_current_user(conn: HTTPConnection, db: Db) -> User | None:
+async def get_current_user(conn: HTTPConnection, db: Db) -> User | None:
     """Resolve the session cookie to a user, or None when signed out.
 
+    ⚠ `async def`, and that is load-bearing rather than tidy. FastAPI runs a
+    *sync* dependency in a threadpool, and `i18n.activate` below sets a
+    `ContextVar` -- which anyio copies **into** the thread and discards on the way
+    out, so the language was set in a context nothing else could see and every
+    page rendered in English however anybody's preference was stored. An async
+    dependency is awaited in the request's own task, where the value survives to
+    the render.
+
+    What it costs is one indexed SELECT on the event loop rather than in a
+    thread, which is what every route in this application already does with its
+    session.
+
     Cached on the connection's state so several dependencies in one request do
     not each hit the sessions table.
 
@@ -44,6 +57,11 @@ def get_current_user(conn: HTTPConnection, db: Db) -> User | None:
         return cached
     user = resolve_session(db, conn.cookies.get(COOKIE_NAME))
     conn.state.user = user
+    # The language this request renders in, set here because this is where the
+    # person is already known -- no second session and no second cookie read. A
+    # request that never resolves a user keeps whatever `LanguageMiddleware` set,
+    # which is the instance default.
+    i18n.activate(i18n.for_user(user))
     return user