Fix languages.yml's header (#4179)
Fix languages.yml's header (#4179)

languages.yml's header is defined in two files (languages.yml itself
and script/set-language-ids). b0ecdf3 changed it in languages.yml,
but not in the script. Without this commit, the changes will be
overwritten next time we run script/set-language-ids.
erkyrath/linguist,sebgod/linguist,pchaigno/linguist,github/linguist,github/linguist,sebgod/linguist,pchaigno/linguist,pchaigno/linguist,sebgod/linguist,pchaigno/linguist,sebgod/linguist,github/linguist,erkyrath/linguist,github/linguist,christop/linguist,erkyrath/linguist,erkyrath/linguist,christop/linguist