Добавил описание в заголовке

ublexec.glade

@@ -85,6 +85,7 @@
     <property name="can-focus">False</property>
     <child>
       <object class="GtkImage">
+        <property name="width-request">90</property>
         <property name="visible">True</property>
         <property name="can-focus">False</property>
         <property name="margin-left">5</property>
@@ -102,26 +103,82 @@
         <property name="position">0</property>
       </packing>
     </child>
+    <child>
+      <object class="GtkBox">
+        <property name="visible">True</property>
+        <property name="can-focus">False</property>
+        <child>
+          <object class="GtkBox">
+            <property name="visible">True</property>
+            <property name="can-focus">False</property>
+            <child>
+              <object class="GtkBox">
+                <property name="visible">True</property>
+                <property name="can-focus">False</property>
+                <property name="orientation">vertical</property>
                 <child>
                   <object class="GtkLabel" id="lblInfoHead">
+                    <property name="width-request">255</property>
                     <property name="visible">True</property>
                     <property name="can-focus">False</property>
-        <property name="halign">start</property>
+                    <property name="valign">end</property>
-        <property name="margin-left">5</property>
-        <property name="margin-right">5</property>
-        <property name="margin-start">5</property>
-        <property name="margin-end">5</property>
-        <property name="margin-top">6</property>
-        <property name="margin-bottom">6</property>
                     <property name="label" translatable="yes">Run as...</property>
+                    <property name="xalign">0</property>
                     <attributes>
                       <attribute name="weight" value="bold"/>
                       <attribute name="size" value="15360"/>
                     </attributes>
+                    <style>
+                      <class name="textHead"/>
+                    </style>
+                  </object>
+                  <packing>
+                    <property name="expand">True</property>
+                    <property name="fill">True</property>
+                    <property name="position">0</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkLabel" id="headInfoLabel">
+                    <property name="width-request">255</property>
+                    <property name="visible">True</property>
+                    <property name="can-focus">False</property>
+                    <property name="valign">start</property>
+                    <property name="label" translatable="yes">Run the application as a user with a changed priority</property>
+                    <property name="wrap">True</property>
+                    <property name="xalign">0</property>
+                    <attributes>
+                      <attribute name="weight" value="bold"/>
+                      <attribute name="size" value="12288"/>
+                    </attributes>
+                    <style>
+                      <class name="textHead"/>
+                    </style>
+                  </object>
+                  <packing>
+                    <property name="expand">True</property>
+                    <property name="fill">True</property>
+                    <property name="position">1</property>
+                  </packing>
+                </child>
               </object>
               <packing>
                 <property name="expand">False</property>
                 <property name="fill">True</property>
+                <property name="position">0</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="expand">True</property>
+            <property name="fill">True</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+      </object>
+      <packing>
+        <property name="expand">True</property>
+        <property name="fill">True</property>
         <property name="position">1</property>
       </packing>
     </child>

ublexec.pot

@@ -17,6 +17,9 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
+msgid "Run the application as a user with a changed priority"
+msgstr ""
+
 msgid "File view"
 msgstr ""
 

ublexec_ru.po

@@ -17,6 +17,9 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
+msgid "Run the application as a user with a changed priority"
+msgstr "Выполнить приложение от имени пользователя с изменённым приоритетом"
+
 msgid "File view"
 msgstr "Обзор файлов"