The most common and easy ones are sometimes the most difficult ones. Definitely an Arion sp. and most probably Arion subfuscus. If you look at the EOL link and the main picture there, it is the same picture from the wiki page of Arion fuscus, which is a different species or not, depending the source you are believing...
https://de.wikipedia.org/wiki/Hellbraune_Wegschnecke
https://en.wikipedia.org/wiki/Arion_fuscus
http://www.salamanderseiten.de/naturfotos/schnecken/schnecken-neu.htm
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