[FEATURE] ui improvements

__Tasks:__

- [x] direct upload in content-type (upload to new collection, in the collection dropdown the last visited collection is activated)
- [x] tags in single and multi edit
- [x] view-all toggler in content-type
- [x] language changing in collection
- [x] language changing in media (single and multi-edit)
- [ ] gather feedback for my changes

__Merge with this:__
https://github.com/sulu-cmf/SuluAdminBundle/pull/141

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | none
| Fixed tickets | none
| BC Breaks     | no
| Doc           | none
@marcelmoosbrugger hmm collections and collection (: sound crazy (: