Fix graphical glitch

Right now the name "Private/Incognito" causes a graphical glitch for narrow windows: if the name is too long to fit on one line and gets wrapped, the button to the right of it is stretched vertically to fill both lines, creating an awkward look.

Author: ParadaCarleton

usr/share/webapp-manager/webapp-manager.ui

@@ -453,7 +453,7 @@
                     <property name="visible">True</property>
                     <property name="can-focus">False</property>
                     <property name="halign">end</property>
-                    <property name="label" translatable="yes">Private/Incognito Window:</property>
+                    <property name="label" translatable="yes">Private Window:</property>
                     <property name="wrap">True</property>
                     <property name="max-width-chars">30</property>
                   </object>