Unify tabs, add contextual links

Problem/Motivation

Some configs have tabs, some don't and only accessible via list controller dropdowns. Some of the tabs may be exposed through contextual links but they are not. This may also serve as entry points for those who do not have edit access to the original data otherwise.

Proposed resolution

- Make translate tab names include type names so it is appropriate for contextual links even when merged with other types of links (eg. menu + block); also useful for when the tab shows up among other things, eg. account settings, content type settings, etc.
- Make the translate tab show up as a contextual link as well.

Remaining tasks

Add tests proving contextual links worked.

User interface changes

Each config entity will have a translate tab, no inconsistencies. Translate operations show up as contextual links finally:

API changes

None.