Show keyboard shortcuts also in the property menu entries

To make them easier to discover. They are shown in the tooltips
of the floating panel already, but Gnome3 does not have the floating
panel. Therefore the keyboard shortcuts are not easy to discover
when using Gnome3.

See also https://bugzilla.redhat.com/show_bug.cgi?id=1128912
Remove “Hide Candidates/Display Candidates” from the properties menu

This is almost never changed while using ibus-table, either one
keeps it always on or always off.

It is changeable in the setup tool, that should be enough.  Stuff
which is used so rarely unnecessarily clutters the properties menu.
If the database is not CJK, set sensitivity to comboboxes useful only for CJK to OFF
Disable properties related to fullwidth/halfwidth for non-CJK tables

Resolves: rhbz#1128912  - With the new "rusle" table in ibus-table-cyrillic, typing space works strangely
See: https://bugzilla.redhat.com/show_bug.cgi?id=1128912
Release v1.8.8