"Plautdietsch" is a variant of Low German originating in Prussia with Dutch and Flamish roots. Today spoken predominantely by ethnic communities in Mexico, Belize, Bolivia, Paraguay, USA, Canada, Argentina and Brazil. A secondary user group is based in Germany and Russia. Plautdietsch (pdt) is very distinct from Low German (nds). The BCP 47 codes would be: -> pdt => general language code -> pdt-019 => primary user group locale -> pdt-150 => secondary user group with alternative spellings PDT uses the Latin script, same as English, German and Spanish. The colating order would follow German (de) for now. Though that is still in flux, and might change slightly in the future. The quotation marks follow English (en-US). The currency formats follow the corresponding country codes. Since users are often using older Hardware and Software it would be nice to have the language added at least from the 4.3.x series. That is also the version included with Debian 8 that I am still using. Mario L. Epp
Just saw the RFE now after I already answered the mail on the l10n list and added pdt-CA to the language listbox. We usually don't backport UI string changes to existing releases because that would impose work on the l10n teams where suddenly an English entry would be visible in an otherwise translated UI. That being said, 4.3.x is way EOL ... if you want to backport that to any old distro you'd have to talk to the package maintainers, but I doubt that would be successful. Fwiw, the commit adding this to master is https://cgit.freedesktop.org/libreoffice/core/commit/?id=01c7c4e1cb074f88440336068285495743bd6b37 and I can cherry-pick it to 6-0 as well, but no earlier release.
Eike Rathke committed a patch related to this issue. It has been pushed to "libreoffice-6-0": http://cgit.freedesktop.org/libreoffice/core/commit/?id=a76e28636a4f3c293b9e10135ca9100885289136&h=libreoffice-6-0 Resolves: tdf#114201 Add Plautdietsch [pdt-CA] to language listbox It will be available in 6.0.0.1. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.