WRC130 Various small changes

[mixmixmix]

• Expanded gitignore for popular temporary files
• By accident blackened some files
• compressed background image
• corrected display of background image
• In the schema I've changed program areas and added empty fields for approval
• Change incorrect references to "Category" as "Group"
• Change name "Private" to "Internal"
• Added configuration of the login button from ansible variable
• Added about page.

Testing

I did reasonable amount of user testing :)

Checklist

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• The Jira ticket for this issue has been updated to "Ready to Review" or equivalent.
• I have developed these changes in discussion with the appropriate project manager.
• My code follows the general Fjelltopp documentation (see Confluence).
• I have made corresponding changes to the Fjelltopp documentation (see Confluence).
• I have rebased this branch with master.
• New dependency changes have been committed.
• I have added automated tests that prove my fix is effective or that my feature works.
• New and existing tests pass locally with my changes.
• My changes generate no new warnings.
• I have performed a self-review of my own code.
• I have assigned at least one reviewer.
• I have assigned at least one label to this PR: "patch", "minor", "major".

[ChasNelson1990]

In other projects (AFRO) when we wanted to rename groups we didn't just create templates overwriting it - we used the translation engine to make an "English (Fjelltoppian)" - this is more robust and also compatible with plugins. @A-Souhei can advise on how much work this was?