Simple style changes to the WordMenu

- 'Sort by' now is a tooltip for the sort icon.
- 'Table:' before add/remove options in SearchFilter is now removed.
- Changed the translations a little, need to do so at the server.
  Commands where:
  DELETE FROM Page_StaticTranslation WHERE Req = 'menu_words_filterTitleMultiWords';
  DELETE FROM Page_StaticDescription WHERE Req = 'menu_words_filterTitleMultiWords';
  UPDATE Page_StaticDescription SET Description = 'Tooltip for sort icon in Wordmenu' WHERE Req = 'menu_words_selectortext';
  UPDATE Page_StaticTranslation SET Trans = 'Sort by alphabetical/meaning sets' WHERE Req = 'menu_words_selectortext' AND TranslationId = 1;
Bugfixes in WordMenuView

- The MeaningGroupCollection was updated only on global changes,
  but not on changes between studies.
  This led to the MeaningGroupCollection containing outdated languages,
  and thus carrying them over to different studies.
- I've also remove the setModel approach from WordMenuView entirely,
  so that no deep merges are performed on the model any more.
- Closes #18
Fixed sorting of Words in their MeaningGroups.

- Instead of sorting Words by their Id they are now sorted by their MeaningGroupMemberIx inside of MeaningGroups.
- Fixes #21