metadata: fix text wrapping on unicode characters

We were passing the utf-8 encoded string to textwrap, which took the
bytes as characters. Hence multi-byte unicode characters (in utf-8)
would count as multiple columns, which is clearly wrong.

fdroidserver/metadata.py

@@ -525,9 +525,10 @@ class DescriptionFormatter:
         self.state = self.stNONE
         whole_para = ' '.join(self.para_lines)
         self.addtext(whole_para)
-        self.text.write(textwrap.fill(whole_para, 80,
-                                      break_long_words=False,
-                                      break_on_hyphens=False))
+        wrapped = textwrap.fill(whole_para.decode('utf-8'), 80,
+                                break_long_words=False,
+                                break_on_hyphens=False)
+        self.text.write(wrapped.encode('utf-8'))
         self.html.write('</p>')
         del self.para_lines[:]