- Reorganized settings management

- Added localisation UI
- Added Greek localisation
- Message text refactoring


FossilOrigin-Name: 05f2cac387c4a3863197f794c68421f7e04fb28e

ui/SettingsDialog.ui

@@ -227,6 +227,26 @@
          </property>
         </widget>
        </item>
+       <item row="5" column="0">
+        <widget class="QLabel" name="uILanguageLabel">
+         <property name="text">
+          <string>Language</string>
+         </property>
+        </widget>
+       </item>
+       <item row="5" column="1">
+        <widget class="QComboBox" name="cmbActiveLanguage">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="toolTip">
+          <string>Language to use for the user interface</string>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
      <widget class="QWidget" name="tabRepo">