CollectionMembersAdd: fix strings.

app/src/main/res/layout/add_member_fragment.xml

@@ -10,12 +10,12 @@
         android:id="@+id/username"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:hint="@string/login_email_address"
+        android:hint="@string/login_username"
         android:inputType="textEmailAddress" />
 
     <CheckBox
         android:id="@+id/read_only"
-        android:text="Read only?"
+        android:text="@string/collection_members_add_read_only"
         style="?android:attr/textAppearanceMedium"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"

app/src/main/res/values/strings.xml

@@ -164,6 +164,7 @@
     <string name="collection_members_list_loading">Loading members...</string>
     <string name="collection_members_list_empty">No members</string>
     <string name="collection_members_add">Invite user</string>
+    <string name="collection_members_add_read_only">Read only</string>
     <string name="collection_members_add_error">Error adding member</string>
     <string name="collection_members_adding">Inviting user</string>
     <string name="collection_members_add_success">Invitation sent. User will be added once the invitation has been accepted.</string>