Error popup

[DNSB]

I went to clean up some files after conversion and polishing and got a popup error message when I selected the files and then clicked on remove files of a specific format. I've attached the image to this message. The error text is below. When I retried the operation, the error did not repeat.

Spoiler:

calibre, version 3.40.1
ERROR: Unhandled exception: <b>TypeError</b>:ugettext() takes exactly 2 arguments (3 given)

calibre 3.40.1 [64bit]  embedded-python: True is64bit: True
Windows-10-10.0.17763-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.17763')
Python 2.7.15+
Windows: ('10', '10.0.17763', 'SP0', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 6, 2) && Kindle covers (G) (0, 3, 0) && Smashwords Metadata (0, 0, 3) && Diaps Editing Toolbag (0, 3, 5) && Webscription (1, 1, 2) && Modify ePub (1, 3, 13) && KindleUnpack - The Plugin (0, 81, 5) && Open With (1, 5, 11) && Goodreads (1, 4, 0) && Kobo Utilities (2, 6, 3) && KoboTouchExtended (3, 0, 2) && Find Duplicates (1, 6, 3) && Barnes & Noble (1, 2, 15) && Quality Check (1, 9, 11) && Kobo Books (1, 5, 0) && Annotations (1, 8, 2) && Fantastic Fiction (1, 3, 0) && EpubCheck (0, 1, 6) && SmartEject (2, 2, 0) && Obok DeDRM (6, 5, 4)
Traceback (most recent call last):
  File "site-packages\calibre\gui2\dialogs\select_formats.py", line 40, in data
TypeError: ugettext() takes exactly 2 arguments (3 given)

[kovidgoyal]

https://github.com/kovidgoyal/calibr...e6d277df4f4604

[DNSB]

Thanks again for the very speedy service.