[l10n] Arabic translation update.
Remove unused 'wp_modes' from pref.glade (it is used in desktop-pref.glade).
[l10n] Romanian translation update.
[l10n] Serbian translations update.
[l10n] Indonesian translation update.
[l10n] Chinese simplified translation update.
[l10n] Persian translation update.
[l10n]Japanese translation update.
[l10n]Spanish translation update.
Improve debug on fm_tab_page_destroy() to diagnose #3614500.
Commit from LXDE Pootle server by user brother.: 201 of 201 strings translated (0 fuzzy).
Fix 'make check': add autogenerated files into POTFILES.skip list.
Commit from LXDE Pootle server by user LStranger.: 201 of 201 strings translated (0 fuzzy).
Commit from LXDE Pootle server by user Asier_Iturralde_Sarasola.: 201 of 201 strings translated (0 fuzzy).
Copyright update in About dialog: it should show 2013, not 2012.

Also added myself in Copyright subwindow.
man page: minus signs should be escaped in groff text.

If minus sign isn't escaped with backslash then it will be replaced
with hyphen and such break possible copy-paste and search contents.
Set wrap_license in About dialog to False, it's wrapped oddly otherwise.
Commit from LXDE Pootle server by user kizito.: 179 of 201 strings translated (12 fuzzy).
Commit from LXDE Pootle server by user Fitoschido.: 201 of 201 strings translated (0 fuzzy).
Fix format warning (%lld should get long long int instead of gint64).