Werk #10631: Change description title of graph axis

Component	User interface
Title	Change description title of graph axis
Date	Jan 7, 2020
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Changed label text for the y axis of time trend graph from 'Hours' to 'Time'.

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