#: ../iw/progress_gui.py:37
msgid " MB"
                                                                                
#: ../iw/progress_gui.py:40
msgid " KB"

#: ../iw/progress_gui.py:43
msgid " Byte"
                                                                  
#: ../iw/progress_gui.py:45
msgid " Bytes"

If these messages are preceded in the code by a number, I imagine this can be
difficult to translate correctly for RTL languages -- the number and the word
would end up in the wrong order.

Please include a printf-style specifier too in these messages, so that they can
be translated correctly even in RTL environments:

msgid "%ld MB"
msgid "%ld KB"
msgid "%ld Byte"
msgid "%ld Bytes"

or something like that.