Add disambiguation info to source strings

src/gui/PasswordGeneratorWidget.ui

@@ -2,6 +2,14 @@
 <ui version="4.0">
  <class>PasswordGeneratorWidget</class>
  <widget class="QWidget" name="PasswordGeneratorWidget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>547</width>
+    <height>352</height>
+   </rect>
+  </property>
   <property name="sizePolicy">
    <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
     <horstretch>0</horstretch>
@@ -100,7 +108,7 @@ QProgressBar::chunk {
           </size>
          </property>
          <property name="text">
-          <string>strength</string>
+          <string comment="Password strength">strength</string>
          </property>
          <property name="textFormat">
           <enum>Qt::PlainText</enum>