The official Google Translate app for iPhone is now available in the App store! 

Official description 
Translate words and phrases between more than 50 languages using Google Translate for iOS. For most languages, you can speak your phrases and hear the corresponding translations.

With Google Translate you can:
› Translate text between 57 languages.
› Translate by speaking the text instead of typing it (15 languages).
› Listen to your translations spoken aloud (23 languages).
› Display translations in full screen mode to make it easier for others nearby to read.
› Star your favourite translations for quick access even when you’re offline.
› Access your translation history even when you’re offline.
› Spell out the translation of non-Latin script languages (e.g. Chinese, Japanese, etc..) in Latin characters to read it phonetically (e.g. Pinyin, Romaji).
› View additional dictionary results for single words or short phrases.

The iPhone app supports Dutch and has a lot in common with the Android app that was launched more than one year ago.