Strings n things

[rtibbles]

Summary

Description of the change(s) you made

• Updates strings according to feedback from string review
• Updates most 'field required' specific messages to a generic 'This field is required' - with the exception of the license description which has additional explanatory text as to why a description is needed.
• Removes string typos that were copy pasted from Kolibri strings
• Sorts the 'Requirements' dropdown
• Separates out peers and teachers to align with original spec
• Adds a contextual hint to add further description in case of catch all 'other supplies' selection
• Moves the For Beginners annotation out of the dropdown and into a separate checkbox under the Audience section

Manual verification steps performed

1. Verified updated sorting and display of requirements dropdown
2. Confirmed functionality and backend persistence of new for beginners checkbox

Screenshots (if applicable)

Does this introduce any tech-debt items?

I used KCheckbox to avoid relying on the soon to be deprecated Checkbox and VCheckbox but this might need to be tidied up as I had to tweak styling to match the existing checkboxes @thanksameeelian FYI!

References

Fixes #3686
Fixes #3695

Reviewer's Checklist

This section is for reviewers to fill out.

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[radinamatic]

Not able to test this to see the strings live, but all the suggested changes seem to be in place 👍🏽
Looking forward to seeing them on Crowdin! 💯

[bjester]

LGTM