Issue #3570122: Implement language switcher component

Stephan Huberrequested to merge
issue/la_eu-3570122:3570122-implement-language-switcher into staging
  • Add language switcher beside the main navigation menu
  • Style with pipe separators and underline for active language
  • Works on both desktop (above menu) and mobile (in slide-out panel)
  • Added in block layout; disabled by default (should be enabled via config override or config split)

Closes #3570122

Edited by Roman Paska

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