Italian translation update

Added missing strings
*6749* Modifying LOCKSS manager description
*4194* DOI display on table of contents
*4194* DOI display for citation formats
*8249* Adding mk_MK locale
*8460* Updates to da_DK locale
*8192* Updates to el_GR locale
*8149* Adding es_AR locale
*8466* Add pl_PL locale
*8149 Adding es_AR locale
*6749* Modifying LOCKSS manager description
Merge pull request #105 from marchitelli/ojs-stable-2_4

Italian translation update
*8158* Fixed UTF8 BOMs
*8158* Revert symlink change
*8158* Spacing retentiveness
*7846* updates to German locale, changes between 20130820 and 20131105
Merge pull request #106 from mtub/20131105-de-DE-locale

*7846* updates to German locale, changes between 20130820 and 20131105
*8468* Correct accidental storage of article ID with issue
*8471* introduce Stop Forum Spam plugin
*8471* improve documentation