[gnome-font-viewer] Update Arabic translation

[Khaled Hosny <khaledh src gnome org>]

commit 3e2b14a19c22b2319b4ef02c202ad1e9ba3ebcc8
Author: Khaled Hosny <khaledhosny eglug org>
Date:   Fri Jan 5 15:32:12 2018 +0200

    Update Arabic translation

 po/ar.po |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/po/ar.po b/po/ar.po
index 855f927..a495ca6 100644
--- a/po/ar.po
+++ b/po/ar.po
@@ -376,7 +376,7 @@ msgstr "أشكال نهائية"
 #: src/open-type-layout.h:43
 msgctxt "OpenType layout"
 msgid "Flattened accent forms"
-msgstr "أشكال مسطحة من علامات التشكيل"
+msgstr "أشكال مسطحة من الحركات"
 
 #: src/open-type-layout.h:44
 msgctxt "OpenType layout"
@@ -696,7 +696,7 @@ msgstr "محارف علمية سفلى"
 #: src/open-type-layout.h:107
 msgctxt "OpenType layout"
 msgid "Optical size"
-msgstr "مقاس بصري"
+msgstr "الحجم البصري"
 
 #: src/open-type-layout.h:108
 msgctxt "OpenType layout"