Windows does not render regional indicator emoji as graphical flags,
showing raw text (DE, GB) instead. Replace all emoji flag values in
SUPPORTED_LANGUAGES with lowercase ISO 3166-1 alpha-2 country codes,
add the flag-icons@7.3.2 CSS library via CDN, and update templates to
render <span class="fi fi-{code}"> instead of emoji text.
Special cases:
- Welsh (cy): uses flag-icons region code "gb-wls"
- Catalan (ca): falls back to "es" (no dedicated ISO flag)
- Esperanto (eo): uses "un" (UN flag for international language)
<option> elements in profile.html no longer display flags since CSS
icon classes cannot be applied inside native <option> tags.
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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