Support for (biblatex) langid field in entry editor #10868

[Skydrite]

Issue Link

This pull request resolves [#10868](https://github.com/JabRef/jabref/issues/10868) (Support for (biblatex) langid field in entry editor)

Issue description

The field langid is missing among the standard fields, which is used for hyphenation and whether sentence casing is applied.

Modifications and Results

At org.jabref.model.entry.field.StandardField#StandardField, the enum StandardField was missing the constant langid which was added. It is now possible to add the langid field to an entry type through the preferences menu.

Tests Added

No new tests were added, as the only change was adding a constant to an enum. Also, no tests relating to other standard fields were found in test.org.jabref.model.entry.field.StandardField#StandardField.

Mandatory

• Change in [CHANGELOG.md](http://changelog.md/) described in a way that is understandable for the average user (if applicable)
• 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](https://devdocs.jabref.org/): Is the information available and up to date? If not, I outlined it in this pull request.
• [Checked documentation](https://docs.jabref.org/): 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.

Discussion

1. Should we still add new tests? If so, can you give pointers as to how we can test this?
2. Should we open new issues for the missing implementation of importers/exporters supporting the langid field?

[enesbkoca]

I'm working together with @Skydrite, and we will address the one failing unit test which is caused by the comparison of the xml file created prior. We are going to fix this by adding the corresponding table-cell of langid and value insideOldOpenOfficeCalcExportFormatContentSingleEntry.xml located insrc/test/resources/org/jabref/logic/exporter/OldOpenOfficeCalcExportFormatContentSingleEntry.xml.

[Siedlerchr]

Thanks for the quick follow up and for contribution!