taxonomy/term/%1 Filter outputs "@command-with-section/plain" as title

Actually i have no idea on earth where this comes from. Are you able to grep/search in all your code after this snippet?
If you put this into drupal there are gazillions of sites with this problem, crazy.

Sadly i can't find this in my code basis of drupal+contrib modules.

I found the bug!
It is in the translations.
go to /admin/config/regional/translate/translate and search for "command"
you will find one entry %1. Edit it and you will see.

Maybe someone should move this bug to the translation section.

Let's do it, seems to make sense but sadly i can't reproduce this, even imported a full po file.
What kind of strings do you have imported on your site?

(Issue applies to Drupal core 7.8 as well, so I'm not sure about the version change in #4)

Hopefully my beginner's pondering can be of any help ...
To reproduce this
Install admin_menu, activate Administration views and enable the view Taxonomy Term. Check for current translation. (I am only using German and English so far - does it appear in any other translation?)

I use Localization update. The phenomenon appeared when I used it to apply all pending translations (although I'm not sure if I have enabled the taxonomy term view beforehand). But I can't find the strings in any .po file, neither in /sites/all/translations nor elsewhere.

Thoughts
I searched a dump of my database for "command-with-section" and found it 3 times - which is exactly the amount of taxonomy terms I clicked to verify my findings. This is way above my head, but is it possible that this funny "translation" is somehow generated?

I reckon once you use the interface translation to get rid of this, you won't be able to reproduce it anyways - am I wrong?

i had that too.

just go to: http://dev.url.com/admin/config/regional/translate/translate

and search for @command-with-section
and the kill the funny translation

I just discovered this as well. Happened after running a batch update through the Localization update module.
Seems like an error in the latest views translation German set (line 737)

msgid "%1"
msgstr ""
"%1@command-with-section/plain\n"
"%1 is the command name, %2 is its man section"

http://ftp.drupal.org/files/translations/7.x/views/views-7.x-3.0-rc1.de.po

As mentioned in #6 removing the string in the translation interface resolve it.

Looks to be fixed or at least I'm not able to find these two strings on l.d.o