Thanks to Patricio Hernández, MetrO for iPhone will soon be available in Spanish and Italian, in addition to the existing translations in English, French and German.
Because these days I try to spend as much time as I can on Android (I swear I make progress), I will not be able to add the remaining missing features to the iPhone version any time soon. Therefore, it makes sense to translate the program in its current state.
If you are interested in having the app in your own language (besides the 5 above), here is what you can do: download the strings file (it is plain text), translate the text it contains and send me the result (akaiv[at]yahoo[dot]fr).
I will submit the new version of the app to Apple on Sunday evening (Paris time). If you send me a translation before, it should make it in the coming release...