[WIP] Add preliminary translation overrides

[panda-madness]

This is a preliminary PR for refactoring the way this extensions stores translated content.

Right now I've written code that overrides Bolt's default Schema Manager to create additional translation tables for each contenttype (one for each defined locale per contenttype).

Still needs doing:

• [ ] Make setcontent read data from translate tables instead of the original.
• [ ] Override record creation and editing
• [ ] Figure out a way to translate repeaters (regular and the new blocks from 3.4)

I will add code to this PR as I figure out the above points.

Any help with the above will be greatly appreciated.

[SvanteRichter]

Hey, is this still worked on? It seems like it'd be a very nice solution to a lot of the problems we have with translate, but it it isn't worked in it might be better to close it.

[panda-madness]

@SahAssar I haven't properly worked on this in a while, so ATM it might be best to close this. If I ever get a more complete PR in shape I'll make a new one. Sorry for the mess.

[SvanteRichter]

No problem :)