added title for map in lang

Adds correct title to map website

What does this MR do?

Adding the title of the map to the language files.

How confident are you it won't break things if deployed?

pretty sure.

Links to related issues

https://foodsharing.de/karte

How to test

Check that title (name in tab) is "Karte" instead of "map".

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))
• Once your MR has been merged, you are responsible to update the #foodsharing-beta Slack channel about what has been changed here. They will test your work in different browsers, roles or other settings