[DE/DE-formal] Interaction messages

[strarsis]

@DanielBiegler: UI interaction confirmation feature was added to Pannellum which also adds new interaction message strings.
This PR adds the German non-formal and formal translations for these new strings.

[DanielBiegler]

Nice work on the PR! I'll get this merged now but updating the npm package has to wait a day or two. :)

[DanielBiegler]

Oh btw @strarsis would you like to take over this repo and the npm package? Then I can stop being a bottleneck for future updates.

[strarsis]

@DanielBiegler: Yes, you can make me repo maintainer, if you'd like.
Edit: And I need the npm credentials so I can push the packages under the same author/name?

[DanielBiegler]

@strarsis you need to delete your fork of this repo, else I get the following error:

strarsis/pannellum-translation already exists

After that you'll get a confirmation mail. More info from Github: https://docs.github.com/en/github/administering-a-repository/transferring-a-repository

Also I need your NPM username, after that I'll sort that out, here the npm docs: https://docs.npmjs.com/transferring-a-package-from-a-user-account-to-another-user-account

[strarsis]

@DanielBiegler: This passed out of mind a bit, sorry.

1. The GitHub fork strarsis/pannellum-translation was deleted.
2. Please re-start the transfer so I can get the confirmation email and confirm the transfer.
3. My npm username is strarsis (same as in GitHub).

[DanielBiegler]

@strarsis OK, I started the transfer on Github, check your mail. I added you as a maintainer on NPM as well. Please confirm when you accept. After you confirm I can remove myself! Have a nice day! :)

[strarsis]

@DanielBiegler: OK, transfer is completed. I am maintainer now of the pannellum-translation package and this repository was transferred to my GitHub account.

[DanielBiegler]

Nice. I removed myself from NPM now. Cheers.