Issue #2863629 by sleitner, jmaties, armrus, ravi.shankar, yogeshmpawar,...

Issue #2863629 by sleitner, jmaties, armrus, ravi.shankar, yogeshmpawar, smustgrave, Chris64, quietone, alexpott: Only fallback to an existing singular or nth plural form of a translation

(cherry picked from commit 47b08da6)