Store journal abbreviation lists in specified directory

[adhamahmad]

Closes #10557.

TODO (Not implemented in this PR):

• Implement automatic detection of journal lists in the specified directory:
• Implementation of .csv to .mv store conversion

UI changes:

Mandatory checks

• I own the copyright of the code submitted and I licence it under the MIT license
• Change in CHANGELOG.md described in a way that is understandable for the average user (if change is visible to the user)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

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[koppor]

Thank you for working on this.

TODO (Not implemented in this PR):

What does this mean?

Will there be follow-up PRs? Do you intent to work on this in the context of commits to this PR?

[adhamahmad]

@koppor

I intend to include them as additional commits within this PR.

[koppor]

I intend to include them as additional commits within this PR.

Nice! 👍