New translations strings.xml (Arabic)

mastodon/src/main/res/values-ar-rSA/strings.xml

@@ -498,6 +498,7 @@
 	<string name="settings_filter_title">العنوان</string>
 	<string name="add">إضافة</string>
 	<string name="filter_word_or_phrase">كلمة أو عبارة</string>
+	<string name="enter_selection_mode">اختر</string>
 	<string name="select_all">اختيار الكل</string>
 	<string name="filter_duration_custom">مخصص</string>
 	<string name="required_form_field_blank">لا يمكن أن يكون فارغاً</string>