Bug 31694: (follow-up) Further improve translatability

Bug 31694: (follow-up) Further improve translatability

To test:
* Add rules fo different modules and with different settings
* Verify the saved module description for a saved rule matches the pull down
* Verify the saved filter matches the pull downs (especially for source and patron category)

Also:
* Renames 'User category' to 'Patron category'
* Remove some values from translations, that shouldn't be translated, like value attributs for options.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jan Kissig <jkissig@th-wildau.de>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>