Cleanup and fix loading of translations. #3836
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Pull Request Checklist
Description
Closes #3835
The new code clearly distinguishes between loading default translations from the "base" theme and loading (additional) translations from the (inherited) themes.
Also the former method put the directories onto sys.path and imported the translation files as modules. This not only keeps the whole module in memory (which might be neglectable nowadays) but also requires extra code to reload the module for each theme. The new method loads the file and executes it using exec().
As a side-effect, this also fixed the bug that translations provided by the "base" theme got lost if another theme provided additional message strings. See #3835.
Output from the tests shown in #3835: