Add frontend i18n support using inlang/paraglide

[Copilot]

Adds internationalization support to the frontend with English and Polish translations for all user-facing strings.

Changes

Translation Files

• Added 210 translation keys to messages/en.json and messages/pl.json
• Fixed project.inlang/settings.json path pattern (./messages/ → ../messages/)

Components Updated

Core auth/navigation:

• +error.svelte, login/+page.svelte, register/+page.svelte
• user-menu.svelte, settings-dialog.svelte, navigation.svelte

Map/event components:

• fab-menu.svelte, event-preview-drawer.svelte
• login-alert-dialog.svelte, chat-input.svelte

Usage

<script lang="ts">
  import * as m from "$lib/paraglide/messages";
</script>

<h1>{m.sign_in_title()}</h1>
<Button>{m.create_an_event()}</Button>

Translation keys follow snake_case naming (e.g., error_page_not_found, create_account, your_communities).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.jsdelivr.net
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/Cartesian/Cartesian/Cartesian.Frontend/node_modules/.bin/../vite/bin/vite.js build (dns block)
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/Cartesian/Cartesian/Cartesian.Frontend/node_modules/.bin/../@inlang/paraglide-js/bin/run.js compile --project ./project.inlang --outdir ./src/lib/paraglide (dns block)
• eu.posthog.com
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/Cartesian/Cartesian/Cartesian.Frontend/node_modules/.bin/../vite/bin/vite.js build (dns block)
  • Triggering command: /usr/local/bin/node node /home/REDACTED/work/Cartesian/Cartesian/Cartesian.Frontend/node_modules/.bin/../@inlang/paraglide-js/bin/run.js compile --project ./project.inlang --outdir ./src/lib/paraglide (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Find all strings in the frontend code and add them to the translations in inlang. Then make sure the frontend elements use the strings. Also, follow the instructions in .github/instructions/AGENTS.instructions.md

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