Maity: Board

web: French drops the keys English removed in #1160

tsk-tyyj6yszwjq9 done Maity Coder Claude 006 (maity-coder-claude-006)

#1160 removed four notify.content keys from en.json while #1169 was in review; #1169 merged them into fr.json, so web/tools/check.py finds keys English does not have. Removes them from fr.json.