Split text generating from rendering

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/widgets.py

@@ -192,8 +192,7 @@ class Widget(object):
             outline=COLOR_DATA[self.color]['border']
         )
 
-    def render_text(self, text, lang_text, base_font_size, bold_font,
-                    pos_x, pos_y):
+    def get_text(self, text, lang_text):
         # Use language variant if desired
         if self.lang is not None and lang_text is not None:
             text = lang_text
@@ -201,7 +200,11 @@ class Widget(object):
                 text = text.replace('English', self.lang.name)
 
         # Format text
-        text = text % self.params
+        return text % self.params
+
+    def render_text(self, text, lang_text, base_font_size, bold_font,
+                    pos_x, pos_y):
+        text = self.get_text(text, lang_text)
         base_font = is_base(text)
         offset = 0