[gnome-control-center/wjt/display-missing-translatable-strings] display: mark 3 missed translatable strings

[Will Thompson <wjt src gnome org>]

commit fd93886f6fecb4de1ca7760ae7c68d29508a127a
Author: Will Thompson <will willthompson co uk>
Date:   Thu Oct 3 17:18:00 2019 +0100

    display: mark 3 missed translatable strings
    
    "Primary Display" and "Contains top bar and Activities" are visible when
    you have >1 display connected and the "Join Displays" option is
    selected. I can't work out how to see the "Active Display" string but it
    sure looks translatable to me.

 panels/display/cc-display-panel.ui | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/panels/display/cc-display-panel.ui b/panels/display/cc-display-panel.ui
index 5ceff8fdf..ed5a414d2 100644
--- a/panels/display/cc-display-panel.ui
+++ b/panels/display/cc-display-panel.ui
@@ -219,8 +219,8 @@
                                           <object class="HdyComboRow" id="primary_display_row">
                                             <property name="visible">True</property>
                                             <property name="can_focus">True</property>
-                                            <property name="subtitle">Contains top bar and 
Activities</property>
-                                            <property name="title">Primary Display</property>
+                                            <property name="subtitle" translatable="yes">Contains top bar 
and Activities</property>
+                                            <property name="title" translatable="yes">Primary 
Display</property>
                                             <signal name="notify::selected-index" 
handler="on_primary_display_selected_index_changed_cb" swapped="yes"/>
                                           </object>
                                         </child>
@@ -384,7 +384,7 @@
                                               <object class="HdyComboRow">
                                                 <property name="visible">True</property>
                                                 <property name="can_focus">True</property>
-                                                <property name="title">Active Display</property>
+                                                <property name="title" translatable="yes">Active 
Display</property>
                                               </object>
                                             </child>
                                           </object>