wrap gettext in koptreader
add gettext to filechooser
add gettext to fileinfo
add gettext to filehistory
add gettext to helppage
add gettext to readerchooser
add gettext to font
add gettext to command
update template and crereader.lua
updage po
Merge pull request #843 from houqp/houqp-master

more gettext in kpv