When using the screenshooter in a Swedish environment the generated filename becomes, e.g. "Skärmbild - 2015-04-15 - 10:55:08.png"

Since colon is used to separated the Swedish time parts in the timestamp the final file is not transferable to an windows environment.


## Proposed solution

Make a new entry in the configuration where the filename could be set using known placeholders like: 

filename_pattern=Screenshot-YYYYMMDD-hhmmss.png

In this way, anyone can create their own generated filename.


## Alternate solution proposal

Simply remove any illegal characters from the generated filename.