- adapted HPGL importer to work within the new app

- in Gerber Editor fixed an error when using the Distance Tool with "Snap to center" option active: if clicking not on a pad Distance Tool was not working
- updated the Turkish translation strings (by Mehmet Kaya)

app_Main.py

@@ -10344,7 +10344,7 @@ class MenuFileHandlers(QtCore.QObject):
                 "Expected to initialize a GeometryObject but got %s" % type(geo_obj)
 
             # Opening the file happens here
-            obj = HPGL2(self)
+            obj = HPGL2(self.app)
             try:
                 HPGL2.parse_file(obj, filename)
             except IOError: