web: on forum page, tell user they have to log in to post #5345

Job	Run time
client-armv6-build	2m 44s
client-arm-build	3m 35s
client-arm64-build	2m 49s
client-x86-build	2m 54s
client-x86_64-build	3m 7s
libs-build	5m 41s
apps-build	8m 37s
libs-cmake-build	6m 51s
manager-build (assembleRelease)	1s
manager-build (assembleXiaomi_release)	1s
manager-build (assembleArmv6_release)	1s
manager-build (jacocoTestReportDebug)	1s
	36m 22s

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