Humanized units are not translatable

Humanized units such as "bytes" are not translatable on the top section of the panel.
The units appear in the string '%(used)s of %(total)s'.
Please refer to the attached screenshot.

[Steps to reproduce]
0) Set up your ubuntuone account.
1) Launch ubuntuone-control-panel-qt
2) At all times, the problem appears.

[Cause]
They are not marked as translatable.
Please look at the following code.
ubuntuone-control-panel-3.0.0/ubuntuone/controlpanel/gui/__init__.py:
259 def humanize(int_bytes):
260 """Return a human readable representation of 'int_bytes'.
261
262 This method follows the https://wiki.ubuntu.com/UnitsPolicy to build
263 the result.
264
265 """
266 units = {0: 'bytes', 1: 'KiB', 2: 'MiB', 3: 'GiB', 4: 'TiB',
267 5: 'PiB', 6: 'Eib', 7: 'ZiB', 8: 'YiB'}
268 unit = 0
269 while int_bytes >= KILOBYTES:
270 int_bytes = int_bytes / float(KILOBYTES)
271 unit += 1
272 str_bytes = "%.1f" % int_bytes
273 str_bytes = str_bytes.rstrip('0')
274 str_bytes = str_bytes.rstrip('.')
275 return '%s %s' % (str_bytes, units[unit])