Added PO file to translation in Spanish

The plugin should load the localized file in /lang.
What do you think?
Updated Spanish Translation
Merge branch 'master' of https://github.com/tareq1988/wp-project-manager

Conflicts:
	readme.md
Fixed button for international languages
Reduced Length of "Project Manager" in Spanish
Added some strings not translated in the source code
Added somes strings
Fixed some chanes
Merge branch 'master' of https://github.com/tareq1988/wp-project-manager
Merge pull request #39 from closemarketing/master

Fixed button for international languages