Fixed duplicate/wrong translation string in fr language

git-svn-id: https://plugins.svn.wordpress.org/simple-diary/trunk@995851 b8457f37-d9ea-0310-8a92-e5e31aec5664
compatibility: tested on WP 4.0

git-svn-id: https://plugins.svn.wordpress.org/simple-diary/trunk@995855 b8457f37-d9ea-0310-8a92-e5e31aec5664