FireStats 1.5 translations

[Omry Yadan]

Hi All,
The following translations have not yet been updated in th 1.5 branch.

firestats-nl_NL.po
firestats-pl_PL.po
firestats-ru_RU.po
firestats-si_SI.po
firestats-sv_SE.po
firestats-zh_CN.po

I expect to release 1.5 stable within the next few weeks, and I intend
to remove any translation file which is not maintained from the stable
release.

please update your translations. if you need help with anything, don't
hesitate to ask.

Omry.