[IMP] tools: create TranslationModuleReader class

Instead of previous long methods, use a class to clarify what the
export actually does.
The TranslationModuleReader is written to copy the API of the
TranslationFileWriter.
This way, exporting translations is reduced to:
1. create a reader that will fetch all module translations (either
   from db or from static files)
2. create a writer in a specific format (po or csv)
3. export the content from the reader to the writer

Simplify the writer by deducing modules from exported translations
instead of fetching it again in a oneliner (this way can benefit from
yield operations)

Remove the 'all_installed' possibility in modules as it was not
working (creating query with 2 WHERE clause).

The new methode _get_translatable_records works on a per model basis.
This will allow a big performance gain as the previous code was
making a .exists() for each record individually.
In the future, this method could be removed as the main goal is to
test the presence of the rare attribute _translate=False.

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