Translate /resources/lang/coop-library.pot in eu (#336)

at least 75% translated for the source file '/resources/lang/coop-library.pot'
on the 'eu' language.

 Manual sync of partially translated files: untranslated content is included with an empty translation or source language content depending on file format

Co-authored-by: transifex-integration[bot] <43880903+transifex-integration[bot]@users.noreply.github.com>