#159236202 Filter Exercise and Ingredient translations better

[RrNn]

What does this PR do?

• This PR allows the translations of Exercises and Ingredients better. Initially, say for exercises, only those that were registered in English were shown regardless of the language selected, but now that's not the case, each selected language comes with its own exercises in that language.

How should this be manually tested?

• Clone this application as described in the README.
• Under the projects directory, git checkout ft-trans-ex-ingrdient-159236202
• After logging in visit the endpoint http://127.0.0.1:8000/en/exercise/overview/ and change the language to any of your choice, the exercises should change accordingly.
• Visiting the endpoint http://127.0.0.1:8000/en/nutrition/ingredient/overview/ and changing the language behaves like explained above too. The displayed ingredients are of the selected languages.

Relevant PT story

• #159236199

[coveralls]

Pull Request Test Coverage Report for Build 468

• 8 of 8 (100.0%) changed or added relevant lines in 2 files are covered.
• 13 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-0.09%) to 93.113%

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Files with Coverage Reduction	New Missed Lines	%
wger/exercises/tests/test_equipment.py	1	100.0%
wger/exercises/tests/test_categories.py	1	100.0%
wger/core/tests/base_testcase.py	2	97.4%
wger/manager/forms.py	2	100.0%
wger/manager/views/set.py	3	96.33%
wger/exercises/tests/test_exercise.py	4	100.0%

Totals
Change from base Build 442:	-0.09%
Covered Lines:	12507
Relevant Lines:	13432

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💛 - Coveralls