Check and correct english text

We got a 98% decent english translation of a dutch website / text but we need to be 100% sure that the text is 100% good and professional. This regards system language so the structure which needs to be checked is like: $MSG['2_0036'] = " seconds if someone bid during the last "; $MSG['2_0037'] = " seconds"; $MSG['2_0038'] = "Please enter valid numeric values"; $MSG ['2 _0039 '] = "Automatic extension products settings updated"; $MSG['2__0001'] = "Choose language"; $MSG['2__0002'] = "Multilingual support"; $MGS_2__0003 = "The default language is English."; $MGS_2__0004 = "Standard Language"; Total # of words: 10K (total # of lines: 2K). We can supply the tekst in an xls file in 1 column (current text) and you are supposed to type a correction (if applicable) next to it.