* src/gnome-utils/glade/preferences.glade: "... Legal values are any single non-alphanumeric unicode character" -> "... A legal value is any single character except letters and number."
> letters&numbers | letter&number | something else

"Any character, except a letter or number, is valid."

* src/report/report-system/report.scm: Translate error messages when a duplicate report name is ignored.
> it is a message, split up into two gnc:error lines... i have not seen any gnc:error translated, but this one is important? make both lines (gnc:error (N_ "...")) or (gnc:error (_ "...")) ?

I don't know.

* lib/libqof/backend/file/qsf-backend.c: "Encoding string to use when writing the XML file." -> clarify wording, e.g. "String encoding to use when writing the XML file." seem to be clearer??

Yes.

* lib/libqof/backend/file/qsf-backend.c: "...by passing the encoding string in this option." -> clarify wording, e.g. "...by passing the string encoding in this option." clearer??

Makes sense, if it's correct.

> can i take them?


* src/gnome-utils/glade/preferences.glade: "Text besi_de icons" -> "Important text besi_de icons" or "Priority text besi_de icons"
> which one?

I think "Priority" better indicates that not everything will be shown.