O.8.0 Bug Images with German ÄÜÖ in the file name

[prog]

O.8.0 Bug.

Images with German Ä or Ü or Ö in the file name can not be uploaded.

I see only "loading 100%"

After changing the name uploading works.

[pejuaxel]

After updating to 0.8.0, I can see the same "uploading 100%", whatever the filename is.

[prog]

The bug is still present, which is very annoying for non english communities.

@julian @baris

[baris]

Pretty sure its the regex in composer-default plugin that's exploding on those chars.