Get rid of stored langstrings in database to support multilang

[adpe]

Summary

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Appendix

Hi @moleculech

I've just done a code review and correct some stuff. Did you also noticed, that it doesn't matter the configured language in the course or profile and the block always takes the German name for the langstring? I've found something here https://moodle.org/mod/forum/discuss.php?d=91157 and I asked in the Telegram Moodle dev chat:

I think we need to add more stuff here:

• Disabled it per default in the global settings. As this is more FFHS-specific.
• Add a setting with the available mod activities, so that the user can select which activities should be listed or not.
• Add a setting with the available course categories or pattern e.g. Referenzkurse, so that the checker will only be displayed in this courses block.

Originally posted by @adpe in #19 (comment)