Usability features

[Dicsolovag]

Hi!

On the Add translation box, I could use an autocomplete dropdown. When I'm typing the translation key, the autocomplete could display the already existing translation keys, until the next dot.
In this case if you just start a new translation add process, and did not select any existing translation, you could traverse through the tree faster. (of course selecting from dropdown and pressing tab or space key could insert the selected item)

Thanks
Tom