Please describe the problem:
The "text circle" script (Xtns->Script-Fu->Logos->Text Circle) does nothing if
the sequence to transform contains accentuated letters (é, ô, ...)

Steps to reproduce:
1. Launch the "text circle" script (Xtns->Script-Fu->Logos->Text Circle)
2. In the "text" textfield, enter a sequence containing accentuated letter, e.g. é
3. Press "Ok"


Actual results:
The script parameters window close and no new window (containing the "bended"
text) is brought.

Expected results:
To obtain a new window with the "bended" text :)

Does this happen every time?
Yes

Other information:
The bug is present in Gimp 2.2.8 (tested on Ubuntu Breezy) and in Gimp 2.2.11
(tested on Debian Testing).