[Etoys] work around layout checking of msgfmt

[Takashi Yamamiya]

Thank you for validation of PO files,
I'll merge them.

For po files written by translators, I use msgmerge to validate it.
So I think this procedure works well.

Cheers,
- Takashi

> A quick fix for the exporter is attached. 
> I think also some qualificaton procedure on build time
> might be needed if LaunchPad doesn't have validation for
> this.
> 
> PO and line numbers with problem are attached below.
> (Takashi, could you please fix them in SVN?):