[BUGFIX] Fixes #630

Added more languages in condition so content elements is shown in both columns in page language view.
Includes all translations of the page in the condition.
Added initializeLanguages to initialize languages in PageLayoutView, to get flag icons in BE.
[FIX] Added condition for 'single' mode to get flag icons in BE.
[FIX] Changed condition for what content to render in FE.

Lets content with language [All] render.
Also content_fallback can be enabled so 'Default' content can be rendered if it isn't translated.