*8673* adding copy and preview icons, cleaning up epub icon.
Merge pull request #81 from FourthAndVine/master

*8673* Adding copy and preview icons, cleaning up epub icon.
Plugin parent class introduction
*8673* Remove FIXME in prep for new icon sheet
*8673* Fixing icon alignment for new icons.
Merge pull request #82 from FourthAndVine/master

*8673* Fixing icon alignment for new icons.
Plugin classes proper use of abstract
Abstract classes defined where required
*8566* Move import/export to tools handler
*8566* Remove unnecessary subclassing
Improve doxygen documentation for grids
*8717* Make submit forms id unique
consider also string param for the web service request
*8720* Add xml:lang to html element for accessibility
Suppress warning for race conditions
*8581* Relax all-fields-required behavior for payment settings form
fixed wrong locale names, ca_ES locale
fixed wrong locale names, el_GR locale
fixed wrong locale names, es_ES locale
fixed wrong locale names, fa_IR locale