use maxMessageLength for gateway progress bars
translation update
bump version to 1.8
"[CZ]Vodafone park" gateway: fix free/paid detection
[INT]Odorik.cz: specify message length

We can't distinguish a longer first message (160 chars) from a shorter
second message (153 chars). But it's probably better to always show the
shorter version than showing nothing at all.
[CZ]Vodafone_park: fix issues for some people