make "Enter name or number" translateable

Fixes #3703
Closes #3708

// FREEBIE

res/layout/contact_selection_activity.xml

@@ -31,7 +31,7 @@
                       android:layout_width="0px"
                       android:layout_weight="1"
                       android:layout_marginLeft="5dp"
-                      android:hint="Enter name or number"
+                      android:hint="@string/contact_selection_activity__enter_name_or_number"
                       android:inputType="textPersonName"
                       style="@style/TextSecure.TitleTextStyle"
                       android:background="@android:color/transparent"

res/values/strings.xml

@@ -485,21 +485,19 @@
     <string name="QuickResponseService_quick_response_unavailable_when_TextSecure_is_locked">Quick response unavailable when TextSecure is locked!</string>
     <string name="QuickResponseService_problem_sending_message">Problem sending message!</string>
 
-
     <!-- change_passphrase_activity -->
     <string name="change_passphrase_activity__old_passphrase">OLD PASSPHRASE:</string>
     <string name="change_passphrase_activity__new_passphrase">NEW PASSPHRASE:</string>
     <string name="change_passphrase_activity__repeat_new_passphrase">REPEAT NEW PASSPHRASE:</string>
 
+    <!-- contact_selection_activity -->
+    <string name="contact_selection_activity__enter_name_or_number">Enter name or number</string>
+
     <!-- contact_selection_group_activity -->
-    <!-- contact_selection_list_activity -->
     <string name="contact_selection_group_activity__no_contacts">No contacts.</string>
     <string name="contact_selection_group_activity__finding_contacts">Loading contacts&#8230;</string>
 
     <!-- single_contact_selection_activity -->
-    <string name="SingleContactSelectionActivity_you_are_not_registered_with_the_push_service">You are not registered with the push service&#8230;</string>
-    <string name="SingleContactSelectionActivity_updating_directory">Updating directory</string>
-    <string name="SingleContactSelectionActivity_updating_push_directory">Updating push directory&#8230;</string>
     <string name="SingleContactSelectionActivity_contact_photo">Contact Photo</string>
 
     <!-- ContactSelectionListFragment-->