More typos fixed

Author: mfvescovi

app/qtapp/strsvr_qt/convdlg.ui

@@ -155,7 +155,7 @@
       <string/>
      </property>
      <property name="text">
-      <string>Message Types  (Inteval: s) separated by ,</string>
+      <string>Message Types  (Interval: s) separated by ,</string>
      </property>
     </widget>
    </item>

app/winapp/strsvr/convdlg.dfm

@@ -35,7 +35,7 @@ object ConvDialog: TConvDialog
     Top = 34
     Width = 208
     Height = 13
-    Caption = 'Message Types  (Inteval: s) separated by ,'
+    Caption = 'Message Types  (Interval: s) separated by ,'
   end
   object BtnOk: TButton
     Left = 177