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"Safari" is an application, so FM doesn't use any version of "Safari", it uses code library that is used also in Safari. If you remove Safari from your Mac, Web viewer will work.
Admin console may show the name from user agent string, I see Firefox client as "Win Other 51.0".
5.0 is also the version number of macOS Server, the numbering is not the same that macOS.
Perhaps Safari libraries used for FMS 15 are the same than those used on macOS Server and also numbered 5.0.
The complete application which uses also Safari libraries is 10.1 inside Sierra Beta 4 (10.12.4).