[FrameworkBundle][Translation] Extract translation IDs from all of src

[fabpot]

Q	A
Feature PR	symfony/symfony#40229
PR author(s)	@natewiebe13
Merged in	5.3-dev

[natewiebe13]

Note: This is what needs to be updated: https://github.com/symfony/symfony-docs/blob/5.x/translation.rst#extracting-translation-contents-and-updating-catalogs-automatically