Werk #3179: Fix labelling of heartbeat interval for liveproxyd settings

Component	Setup
Title	Fix labelling of heartbeat interval for liveproxyd settings
Date	Feb 23, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Instead of "5/sec" we now correctly write "one heartbeat every 5 sec".

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