*8476* export supp file only if it has a DOI
Merge remote-tracking branch 'upstream/ojs-stable-2_4' into ojs-stable-2_4

Upgrade fork from original.
typo
*8494* Undefined Index/Assertion Failed at DataCite Export/Registration
*8269* consider submission language in QuickSubmit plug-in
*8497* Fix div/form ID collisions
Submodule commit
*8498* Prevent connection before installation
*8499* add new ojs languages to solr
*8500* DataCite Metadata Version 3.0 Support
Line wrapping
*7846* updates to German locale, ojs plugins, changes between 20131105 and 20131205
*7846* updates to German locale, changes between 20131105 and 20131205
*7846* tiny update to acron plugin, de_DE locale
typo in en_US locale
changed key names in ru_RU locale, see 5aabeeb252
*7846* typos in de_DE locale
Merge pull request #112 from mtub/20131205-de-DE-locale

updates to de_DE locale
Partly revised russian translation of plugins