[pitivi] Update Catalan translation

[Jordi Mas <jmas src gnome org>]

commit 08694c2d0c625b751605a6c0f189399b74c29392
Author: Jordi Mas <jmas softcatala org>
Date:   Tue Aug 22 00:14:25 2017 +0200

    Update Catalan translation

 po/ca.po |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/po/ca.po b/po/ca.po
index 9c02e7a..1f5d463 100644
--- a/po/ca.po
+++ b/po/ca.po
@@ -403,7 +403,7 @@ msgstr "Relació d'aspecte:"
 #. DAR is the aspect ratio of the image being displayed to the viewer. "Display" is used as a noun, not as a 
verb/action.
 #: ../data/ui/projectsettings.ui.h:11
 msgid "Display aspect ratio"
-msgstr "Mostra la relació d'aspecte"
+msgstr "Relació d'aspecte de pantalla"
 
 #. PAR is the aspect ratio "of the pixels", not an aspect ratio "in pixels".
 #: ../data/ui/projectsettings.ui.h:13