UHF-11677: Add courses integration frontend changes

[jeremysteerio]

UHF-11677

Enables users to view courses in the event list.

What was done

• Add new logic to filter by event type
• Add new "type" filters to fronted
• Add translations
• Alphabetize some stuff (pet peeve)
• Enable bell icon

How to install

• Make sure your instance is up and running on latest dev branch.
  • git pull origin dev
  • make fresh
• Update the HDBT theme
  • composer require drupal/hdbt:dev-UHF-11677
• Run make drush-cr

⚠️⚠️⚠️⚠️
Notice: Depending on how old your installation is, you might need to follow these instructions to enable the new admin for events: City-of-Helsinki/drupal-helfi-platform-config#978

How to test

• Create a new event list or open up an existing one
• Tick the choices to show both hobbies and events from the admin side
• Open up the page and you should see new filters present on the page
• "See more" button at the bottom of the page should correlate to the admin choices made (event button not shown when no events in the list and vice versa)

Continuous documentation

• This feature has been documented/the documentation has been updated
• This change doesn't require updates to the documentation

Translations

• Translations have been added to .po -files and included in this PR