New UI/Strings in EOG

[Felix Riemann <friemann svn gnome org>]

Hi,

I just commited a new error dialog to EOG.

It is shown when the user tries to save to an unsupported file format
and should avoid a crasher.

This adds 3 translatable strings to EOG.

1) "File format is unknown or unsupported"

2) "Eye of GNOME could not determine a supported writable file format
based on the filename."

3) "Please try a different file extension like .png or .jpg."

1) is the title while 2) and 3) form the secondary text (separated by a
newline).

See bug #427806 for more details.

Bye
Felix