I recently corrected "Brabantic" with "Brabantian", which was quickly replaced with the old term. 
 Maintaining the use of "Brabantic" will make it no less proper English than, say, using "Croatic" for "Croatian". 
 Compare also the French translation: brabançon. 

 I believe that it is imperative that one use the proper English names and terms in the English pages. 
 The language possesses many of its own variants for foreign names and terms, and this certainly includes those from the Netherlandic language as well.  

 Several examples from incorrect usage on this page and the page "Dutch Language": 
 Brabants > Brabantian 
 Zeeland > Zealand* 
 Zeeuws > Zealandic 
 Zeeuwsch-Vlaanderen** > Zealandic Flanders 

 * The Danish Sjælland is also known in English as Zealand. 
 ** The proper Netherlandic orthography: the spelling is not modernized. 

 Just as we expect that an Hindi speaker uses "India" in place of "Bharat" in the English pages, let's be consistent in our own use the appropriate language.