Werk #11921: Fix title of sla columns in view configuration

Component	User interface
Title	Fix title of sla columns in view configuration
Date	Jan 21, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b5 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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