Fix classification of bogus "markup" languages (#3751)
Fix classification of bogus "markup" languages (#3751)

* Reclassify Protocol Buffer as a data-type language

References: #3740

* Fix classification of bogus "markup" languages

* Fix category of the ironically-named "Pure Data"

Ironically and *appropriately* named, might I add.

christop/linguist,sebgod/linguist,stanhu/linguist,stanhu/linguist,yyx990803/linguist,JJ/linguist,stanhu/linguist,pchaigno/linguist,sebgod/linguist,christop/linguist,yyx990803/linguist,github/linguist,JJ/linguist,erkyrath/linguist,pchaigno/linguist,sebgod/linguist,erkyrath/linguist,github/linguist,JJ/linguist,pchaigno/linguist,JJ/linguist,github/linguist,sebgod/linguist,yyx990803/linguist,erkyrath/linguist,yyx990803/linguist,stanhu/linguist,github/linguist,pchaigno/linguist,erkyrath/linguist