Gopal Matcha

Results 2 issues of Gopal Matcha

fixed #206 by adding ListPairHandler to handle /listPairs and updating ListHandler for /list. docs have to be updated accordingly if this pull request is merged.

fixes issue #362 by changing the 't' function's input text from "Cancel" to "Go Back" in both DocTranslationForm.tsx and WebpageTranslationForm.tsx