Werk #7725: mem.linux: Display levels text correctly

Component	Checks & agents
Title	mem.linux: Display levels text correctly
Date	May 23, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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