Change the Bookmarks dialog title to "Bookmarks and Tracks"

Check if there are any string contexts where "Bookmarks" without "Tracks" is still needed. If it is not required, then simply renaming the string key from "bookmarks" to "bookmarks_and_tracks" would solve the issue. If "Bookmarks" is needed somewhere in the bookmarks-only context, then the current translation should be left as-is, and a new key should be added.

1. Because we already support imported tracks from KML
2. GPX import will be added soon too.
3. Track recording is also planned.

For iOS, iphone/plist.txt file should also be updated for a long-tap menu title.