Merge branch 'main' into fix/tracked-info-vertical-rate

CHANGELOG.md

@@ -154,6 +154,18 @@
   the five borough cores load and `CCTV_NYC_MAX_SOURCES` changes the cap. The catalog-wide ceiling is
   unchanged; extra cameras share it round-robin with the other packs.
 
+- Spanish interface (`es`), translated by @meirm (#602) and reviewed against the
+  current English.
+
+- Interface localization, starting with Russian. UI text is marked with
+  `t()`, `tn()` (plurals) and `msg()` in code and `data-i18n*` in markup, keyed
+  by the English text itself; each language is one flat JSON catalog
+  (`src/i18n/locales/ru.json`). The language comes from `?lang=`, the language
+  picker (the globe button in the bottom-right corner), then the browser
+  language; English stays the default and the fallback. `npm run i18n`, also
+  run by `npm test`, fails on missing, unused or broken translations. Built on
+  the i18n foundation by @meirm (#601), with the Russian catalog started
+  from #312. It also fails on UI text that is not marked at all.
 - Street Level counts unique tiles before ranking so overlapping dateline halves
   in polar views do not waste slots in the 16-tile overview budget.
 
@@ -166,6 +178,9 @@
 
 - Director timeline seeks cross the dateline along the short longitude arc.
 
+- Keep unknown GBFS availability counts neutral instead of turning null or empty
+  values into zero bikes.
+
 - Recent Imagery continues past malformed records in full catalog pages, respects the requested record limit, and reports results as truncated when that limit drops valid records.
 
 - Regional articles retain unknown publication times when compact source dates do not identify a real calendar instant.