Providing a tool to integrate users's custom phrases into the (internal) code table and the feature that exporting it to a code table file in plain text format.

[mike-fabian]

See first comment of #103:

In addition, members of Fedora Chinese Users Group have wishes that:

3. Providing a tool to integrate users's custom phrases into the (internal) code table and the feature that exporting it to a code table file in plain text format.