Some cosmetic changes.

- Loading 'pgadmin' as 'sources/pgadmin', as found under the 'sources'
  reference directory to be consistent with other files.
- Removed the 'pgadmin' reference from the base.html template.
- Renamed 'pgadmin.slickgrid.editors.js', and
  'pgadmin.slickgrid.formatters.js' as 'editors.js', and 'formatters.js'
  respectively, as they're already in the 'pgadmin/static/js/slickgrid'
  directory.
- Removed the duplicate entry of 'translations' from the webpack.shim.js

web/pgadmin/misc/bgprocess/static/js/bgprocess.js

@@ -1,5 +1,5 @@
 define('misc.bgprocess', [
-  'pgadmin', 'sources/gettext', 'sources/url_for', 'underscore',
+  'sources/pgadmin', 'sources/gettext', 'sources/url_for', 'underscore',
   'underscore.string', 'jquery', 'pgadmin.browser', 'alertify',
   'pgadmin.browser.messages'
 ], function(