V4.1.2 beta

[briri]

• Update modal search for repositories to allow researchers to define custom repositories that are not a part of the re3data registry #466
• Update modal search for metadata standards to allow researchers and template admins to define custom standards that are not a part of the rda registry
• Refactor custom repository creation for template administrators. Moved functionality into existing modal search window accessed via new 'My repository is not listed' button
• update to api/v2 json to use the correct URL when constructing the link back to the PDF
• Locked better-errors gem to 2.9.1 due to an issue that prevents Rails from starting up unless sassc is installed
• Updated gem and JS dependencies

[github-actions[bot]]

	2 Warnings
:warning:	There are code changes, but no corresponding tests. Please include tests if this PR introduces any modifications in behavior. \n Ignore this warning if the PR ONLY contains translation.io synced updates.
:warning:	This PR is too big! Consider breaking it down into smaller PRs.

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