Translation Project files are out of date
Translations for gst-plugin-base are offered at https://translationproject.org/domain/gst-plugins-base.html
However, these seem to be from gst-plugin-base 1.16 about two years ago. Strings like those added in 18351dcd in 2019 are not offered for translation yet. It would be good if the files on translationproject.org were updated.