help for translators

[Peter Mraz <etkinator gmail com>]

files in with ui.h have clear syntax. For translator woul be helpful if name of widget and his property appear in .po files as comment or msgctx

for example

msgctxt gtkdialog>gtkbox>gtkbutton tooltip

for menus it would be helpfull if full path appear in .po files (traslators need know which accelerator shold choose)

for example

msgctxt >files>new>

for gsetting it would be helpvull add 

msgctx gsettings summary
msgctx gsettings description

It usefull know also

if string is description of command line
if string is notification summary or body
if string is log message
and so on

Please cratetools that this information ad to .po files.