Rewrite tests for license code generation

[obulat]

Fixes

Related to #125 and #117

Description

This PR reworks the tests for license code generation to test the correctness of the generated license code. Instead of hardcoding all the values, we test returned values for correctness.
In addition, previously, generated rich text code was not tested in unit tests because the functional i18n component was not mounted in tests, only showing an i18n stub.

Several items were also fixed:

• When a user inputs the profile URL, but not the name, an unnecessary empty element was inserted into the Rich Text license code.
• CC0 slug for icons is generated correctly
• 'http' is added to the generated code, making it absolute, instead of relative. Previously, the relative URL resulted in links starting with the chooser's URL (or localhost).
• Store is now initialized separately, making it easier to set up for testing.

Screenshots

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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[zackkrida]

This is really, really wonderful work! I love the jsdoc usage in projects—I'm going to make it a part of our JS code standards when I get those published.