Describe the bug
Changing translations midgame does not update translations for research

To Reproduce
Steps to reproduce the behavior:

1. Start or load a game
2. Go to Menu, Options and change from (e.g.) English to German and return the map screen.
3. Select the Research/Task menu and notice how the research uses a mixture of German and English (The Research in Research X is translated but the tech name is not)
4. Go to the Knowledge screen and scroll through the Tech names, which are all still in English.

Expected behavior
The translation change should update immediately in the Research/Task menu and in Knowledge screen.

Desktop (please complete the following information):
All OS/Python versions

Additional context
This is almost certainly a regression from when we moved from data files to ".po" files for translation in-game data content.