GIMP main menu items

[dinasset]

I think you can reset it by simply removing the file pluginrc from your .gimp-2.8 folder to let gimp recreate the standard menu entries.
As you can read from that file (using e.g. notepad++) :
-------------------------------------------------------------------------------------------
" GIMP pluginrc
#
# This file can safely be removed and will be automatically regenerated by
# querying the installed plugins.
--------------------------------------------------------------------------------------------