Easier translation by selecting the text which should be translated

[thaflo]

Hitting Enter after translating a string saves it and loads the next one, which is good!
The focus is set before the new loaded string.
I find it useful (tried it already) when the whole text of the translation view is selected.
The original text is always visible on the left.
Will do a pr. I am translating much faster now, as deleting the old string isn't necessary anymore.