Have a look at
https://en.wiktionary.org/wiki/User:Yair_rand/addcomment.js
It allows you to add a comment, signed and correctly
indented, to the end of a section of a talk page.
It works fine on my Android phone, which is more than
can be said of the regular edit function.
The discussion (ironically in Liquid Threads) is found here,
https://en.wiktionary.org/wiki/Thread:User_talk:Yair_rand/Comment_gadget
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Lars Aronsson (lars(a)aronsson.se)
Aronsson Datateknik -
http://aronsson.se