i18n: update translations & configuration

This patch fixes the language map of the tx conf to integrate new lan-
guages.
It sets the minimum-percent to 1.
Finally, it updates the translations.

Change-Id: Ice04c4308ae25d4a54533d7d60cd5943333fc82c
Tuleap: #609
diff --git a/ring-android/app/src/main/res/values-ar/strings_preferences.xml b/ring-android/app/src/main/res/values-ar/strings_preferences.xml
new file mode 100644
index 0000000..d311703
--- /dev/null
+++ b/ring-android/app/src/main/res/values-ar/strings_preferences.xml
@@ -0,0 +1,4 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<resources>
+  <string name="pref_category_contacts">الاتصالات</string>
+</resources>