Add 24 European languages to the string catalogs

Summary

Adds 24 European languages to bitchat/Localizable.xcstrings and bitchatShareExtension/Localization/Localizable.xcstrings: be, bg, bs, ca, cs, da, el, et, fi, ga, hr, hu, is, lb, lt, lv, mk, mt, nb, ro, sk, sl, sq, sr. That covers every key in both catalogs (518 + 5), bringing the app to 54 locales.

• Each language carries the CLDR plural categories it needs in the three plural substitutions (e.g. few/many for Czech/Slovak/Lithuanian, zero for Latvian, two/few/many for Irish and Maltese).
• The style matches the existing catalogs: lowercase IRC-style text where the English is lowercase, uppercase section headers, and commands, subcommands, #mesh, cashuA… and placeholders left untouched.
• New entries use the state needs_review, so they stand out in Xcode for native-speaker review.
• Existing localizations are unchanged. The catalogs were edited by inserting the new locale blocks rather than re-serializing, and a JSON comparison confirms every pre-existing locale is identical to main. The large diff is only the inserted blocks.

How the translations were produced

The translations were written with an AI assistant, not by native speakers. They were checked mechanically: every key is present, format specifiers and positional arguments match the English, plural categories are complete, and casing is consistent. Native-speaker review is welcome.

Risk

Low. Only string catalogs change, and no code changes.

Tests

This was prepared on a machine without Xcode, so the app was not built or run on iOS/macOS. What was checked:

• both catalogs parse as valid JSON
• the logic of LocalizationCoverageTests (every translatable key covers every locale, and the share extension has the same locale set as the app) was replicated in a script: 0 failures
• every new plural substitution has formatSpecifier, argNum and an other form

Running LocalizationCoverageTests in CI or Xcode would confirm this. knownRegions in the project file was left alone, matching how the existing locales were added.

The companion Android PR, permissionlesstech/bitchat-android#978, adds the same 24 languages.

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