Implement a small gspell-app.

Something like test-text-view without the debug features.

I often need to quickly spell-check a word, either in English or French. So right now I either open gspell's test-text-view but it's not convenient because the binary is not installed; or I open gedit but it's not convenient because the spell-checking is not enabled by default and it takes a lot of clicks to go to the menus; or I use Firefox and I open a random page where I know that it's possible to type text.

What I would like is just to type, in a terminal:
$ gspell-app
$ gspell-app fr

`gspell-app` would just choose the language based on the current locale.