Spelling: 'Bishnupria Manipuri' => 'Bishnupriya Manipuri'

Having the 'y' makes it agree with mediawiki/core's languages/Names.php and
<https://en.wikipedia.org/wiki/Bishnupriya_Manipuri>.

I hope this is correct. I am basing this on the report of a user on #wikitech:

  <LlamaAl> I have noticed a mistake in the interwikis of the English
   Wikipedia's Main Page. When I hover the cursor over Bishnupriya Manipuri,
   the text that appears says "Bishnupria Manipuri". ¿How can this typo be
   corrected? It also affects other wikis.
  <ori> LlamaAl: which is the correct spelling?
  <LlamaAl> ori: Bishnupriya Manipuri
  <LlamaAl> With the 'y'

Change-Id: I577f773114163cc13b3035c190b47374e377efea
Merge "Spelling: 'Bishnupria Manipuri' => 'Bishnupriya Manipuri'"