Translations 02, fixes #15

Done:
- enabled translations of most of the home page
- enabled translations of some parts of POI browsing page - only with existing resource keys, due to possible changes in the page design in issue #24

Still to do:
- on main page:
    - enable translations of the my profile submenu (my profile, my subscriptions, etc.) - they use different kind of links and I did not know how to make them translatable
    - make titles translatable (title as a tag in HTML)
    - make the statistics with "x charging stations across y locations" translatable - used in a function, that's why I did not know how to make them translatable
- on the POI browsing page - many things, but not done with respect to planned changes to its design and possible changes due to issue #24