Add support for deepl glossaries

[david-venhoff]

Short description

This pr adds basic support for deepl glossaries. If enabled, every glossary defined at deepl will be used (undefined behavior if multiple glossaries for the same source to target language pair exist)

For now, the feature is disabled by default. Note to self: Enable the setting on the test server when merged

How to test

• Set DEEPL_GLOSSARIES_ENABLED to True in the settings
• Configure deepl by setting the integreat deepl password to the free deepl api password from passbolt.
• Translate a page that contains glossary words from german to english
• Check that the english translation uses the corresponding glossary entry

You can print out all available glossary entries with print(self.translator.get_glossary_entries(glossary))

~~Note that at the time where I am writing this the de-en dictionary is accidentally reversed (so when translating from de to en, deepl replaces english words in the source translation with german words in the target translation)~~ This is fixed now

Proposed changes

• Load available glossaries on startup
• Use matching glossary, if it exists

Side effects

None, since the feature is disable by default

Resolved issues

Fixes: #3045

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