Force encoding to open XML files

The views and icons file should always be encoded in UTF-8, so it is better to
force it when opening than relying on the default system.

issue5596
review21101002

trytond/ir/ui/icon.py

@@ -50,5 +50,6 @@ class Icon(ModelSQL, ModelView):
 
     def get_icon(self, name):
         path = os.path.join(self.module, self.path.replace('/', os.sep))
-        with file_open(path, subdir='modules', mode='r') as fp:
+        with file_open(path,
+                subdir='modules', mode='r', encoding='utf-8') as fp:
             return fp.read()

trytond/ir/ui/view.py

@@ -193,7 +193,8 @@ class View(ModelSQL, ModelView):
         if self.name and self.module:
             path = os.path.join(self.module, 'view', self.name + '.xml')
             try:
-                with file_open(path, subdir='modules', mode='r') as fp:
+                with file_open(path,
+                        subdir='modules', mode='r', encoding='utf-8') as fp:
                     value = fp.read()
             except IOError:
                 pass