[pitivi] Fix typo in Catalan user docs translation

[Andre Klapper <aklapper src gnome org>]

commit ea45c1e17de4535cb3729dd8fdbb53f51096e254
Author: Andre Klapper <a9016009 gmx de>
Date:   Mon Sep 25 00:17:57 2017 +0200

    Fix typo in Catalan user docs translation

 help/ca/ca.po |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/ca/ca.po b/help/ca/ca.po
index 25aa362..a82ab67 100644
--- a/help/ca/ca.po
+++ b/help/ca/ca.po
@@ -1560,7 +1560,7 @@ msgstr "El vídeo del vostre projecte quan el torneu a reproduir."
 #: C/mainwindow.page:145
 msgid "A <em>live preview</em> when trimming a clip's beginning/end point."
 msgstr ""
-"Una <em>vista prèvia en directe</ em> quan talleu el punt d'inici / final "
+"Una <em>vista prèvia en directe</em> quan talleu el punt d'inici / final "
 "d'una seqüència."
 
 #. (itstool) path: note/title