center vertical items in first row

Change-Id: I08415c11d2e923ae0be005f019cfe6996d8d71a4

cui/uiconfig/ui/thesaurus.ui

@@ -139,6 +139,7 @@
                 <property name="hexpand">True</property>
                 <property name="entry_text_column">0</property>
                 <property name="id_column">1</property>
+                <property name="valign">center</property>
               </object>
               <packing>
                 <property name="left_attach">1</property>
@@ -154,6 +155,7 @@
                 <property name="can_focus">True</property>
                 <property name="receives_default">True</property>
                 <property name="halign">start</property>
+                <property name="valign">center</property>
                 <property name="use_action_appearance">False</property>
                 <property name="image">image1</property>
               </object>
@@ -168,6 +170,7 @@
               <object class="GtkComboBoxText" id="langcb">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
+                <property name="valign">center</property>
               </object>
               <packing>
                 <property name="left_attach">2</property>