erp5_web_monitoring: fix landing page, tests & minor fixes

See merge request !1943
18 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

08:01:43

passed ERP5.PerformanceTest-Master

04:01:06

failed ERP5.UnitTest-Master

08:49:56

passed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS.Eggs.UnitTest-Master.Python3

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failed Wendelin.UnitTest-Master

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passed ERP5.CodingStyleTest-Master

02:54:37

passed ERP5.PerformanceTest-Master

00:34:45

failed ERP5.UnitTest-Master

04:53:22

failed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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failed SlapOS.Eggs.UnitTest-Master.Python2

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passed SlapOS.Eggs.UnitTest-Master.Python2

00:43:29

failed SlapOS.Eggs.UnitTest-Master.Python2

00:21:20

passed SlapOS.Eggs.UnitTest-Master.Python3

00:29:17

passed Wendelin.UnitTest-Master

00:56:21

passed Wendelin.UnitTest-Master

08:36:35