Fix: [bug #856] Mail error if destination user doesn't have an email
Merge pull request #896 from marcosgdf/bug-856

Fix: [bug #856] Mail error if destination user doesn't have an email
Update projects.lang

Add Link element on elements page
Update element.php

add feature: join element from element page
Update project.class.php

Add feature to add element in elements page of a project
Fix: [ bug #855 ] Holiday approval email in French
Fix: [ bug #855 ] Holiday approval email in French
Merge remote-tracking branch 'origin/3.3' into develop

Conflicts:
	htdocs/holiday/fiche.php
Merge pull request #899 from defrance69/patch-2

Update element.php
Merge pull request #898 from defrance69/patch-1

Update projects.lang
Merge pull request #900 from defrance69/patch-3

Update project.class.php
Merge pull request #901 from marcosgdf/develop

Holidays module improvements