There are a few problems with the file options_mw.xml.
The problems appears when extracting chains with xgettext, to build translation files, because some characters are not ansi/ascii.
Lines 399 and 403.
We have there : "Use the processor’s .... but it should be "Use the processor's . The character ’ cause problems to xgettext (not an ascii one).
Line 411 : there is a CR/LF inside the character chain. Here too, xgettext does not seem to like this. Simply, as everywhere, put the chain on only one line.
find here a corrected file which xgettext accepts.
gd_on