As said, if you find https://en.wiktionary.org/?oldid=23646739 or others offensive, please just edit and add {{context|vulgar}} or |obscene or whatever appropriate.
praveenp, 30/03/2014 16:11:
It appears vowel sign ാ used independently to create these captchas which should be avoided.
Yes, all the problems you mention seem just to be consequences of this. The entry in question is https://en.wiktionary.org/wiki/%E0%B4%BE Is there some generalisable learning here? Exclude letters? (Wiktionary experts should tell us if they're all tagged as such.) Only use "words" of at least two unicode characters?
Nemo