Merge pull request #7853 from google/PW-metadata-primary-language

Playwrite: `primary_language` added

diff --cc ofl/playwritear/METADATA.pb
Simple merge

diff --cc ofl/playwriteat/METADATA.pb
Simple merge

diff --cc ofl/playwritebevlg/METADATA.pb
Simple merge

diff --cc ofl/playwritebewal/METADATA.pb
Simple merge

diff --cc ofl/playwritecl/METADATA.pb
Simple merge

diff --cc ofl/playwritecu/METADATA.pb
Simple merge

diff --cc ofl/playwritecz/METADATA.pb
Simple merge

diff --cc ofl/playwritedkloopet/METADATA.pb
Simple merge

diff --cc ofl/playwritedkuloopet/METADATA.pb
Simple merge

diff --cc ofl/playwritehr/METADATA.pb
Simple merge

diff --cc ofl/playwritehrlijeva/METADATA.pb
Simple merge

diff --cc ofl/playwritehu/METADATA.pb
Simple merge

diff --cc ofl/playwritepe/METADATA.pb
Simple merge