Fix copy button in plain text tab under "Use your license"

[ObjectBoxPC]

Fixes

Fixes #206 by @panchovm

Description

This fixes the copy button in the plain text tab under "Use your license" so it will actually copy the text.

Technical details

The cause seemed to be the duplicate IDs between the two different tabs. This pull request creates separate IDs for the text elements. In addition, some other duplicate IDs were converted to classes.

This code seems like it could use an overhaul to make the tabs more flexible. The current code relies on a lot of assumptions (like there being only two tabs, Web and print, with the Web tab having two sub-tabs under it).

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[obulat]

Your change works great, thank you for your contribution, @ObjectBoxPC !