[glade] Fix inconsistent "top-level", "top level", "toplevel" spelling in translatable strings

[Juan Pablo Ugarte <jpu src gnome org>]

commit f86d308586ad8a8f4ea074178a6fd89b85efd32f
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Wed Jun 17 19:59:04 2020 -0300

    Fix inconsistent "top-level", "top level", "toplevel" spelling in translatable strings
    
    https://gitlab.gnome.org/GNOME/glade/-/issues/412

 help/C/index.docbook  | 12 ++++++------
 plugins/gtk+/gtk+.xml |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/help/C/index.docbook b/help/C/index.docbook
index 6a013698..0fc66bb7 100644
--- a/help/C/index.docbook
+++ b/help/C/index.docbook
@@ -324,7 +324,7 @@ widget in the
 you select most widgets, the
                                   pointer changes to a pointer-plus-cross.
 You can then place the widget inside containers,
-                                  top-level  widgets, and so on. After you
+                                  toplevel  widgets, and so on. After you
 place a widget, the mode returns to
                                   selection mode.</para>
                          </listitem> 
@@ -332,18 +332,18 @@ place a widget, the mode returns to
                 </variablelist> 
                 <variablelist> 
                   <varlistentry> 
-                         <term>Top-level placement mode</term> 
+                         <term>Toplevel placement mode</term> 
                          <listitem> 
                                 <para>
-                                  To use top level placement mode, select a
-defined top-level
+                                  To use toplevel placement mode, select a
+defined toplevel
                                   widget in the
-<guilabel>Palette</guilabel> window. When you select a top-level
+<guilabel>Palette</guilabel> window. When you select a toplevel
                                   widget in the 
                                   <guilabel>Palette</guilabel> window, the
 widget appears
                                   immediately on your desktop. You can then
-edit the widget. After you select a top-level widget,
+edit the widget. After you select a toplevel widget,
                                   the mode returns to selection mode.
                                 </para>
                          </listitem> 
diff --git a/plugins/gtk+/gtk+.xml b/plugins/gtk+/gtk+.xml
index ba093044..02bf3163 100644
--- a/plugins/gtk+/gtk+.xml
+++ b/plugins/gtk+/gtk+.xml
@@ -851,7 +851,7 @@
           <property id="type" ignore="True" custom-layout="True">
             <displayable-values>
               <!-- GtkWindowType enumeration value -->
-              <value id="GTK_WINDOW_TOPLEVEL" name="Top Level"/>
+              <value id="GTK_WINDOW_TOPLEVEL" name="Toplevel"/>
               <!-- GtkWindowType enumeration value -->
               <value id="GTK_WINDOW_POPUP" name="Popup"/>
               <!-- GtkWindowType enumeration value -->