Warn if the authenticator is not configured

[polx]

The installation instructions indicate that xwiki.cfg be enriched with two lines.
This is the only part of the installation instructions which is not completely self-explanatory. It is thus suggested to add a warning into the configuration-sheet, so that an administrator is warned that the configuration is missing.

[polx]

This commit (84c646f) provides the necessary function but only works for xwiki version 11 onwards.

[polx]

As it should look like:

[ane-gabriela]

I've tested on 8.4.5, 10.11.8 and 11.5RC1 with Chrome 75. I don't see the message from above anywhere.

I get the same on all of them:

• https://up1.xwikisas.com/#YC_XKkKpngOX_NSaJYtrIA

• https://up1.xwikisas.com/#shCQL3dQW8KuSWRtj13MyA

• https://up1.xwikisas.com/#Hqm9xDQIhkRiUTk43TVrSw

Followed the steps from https://store.xwiki.com/xwiki/bin/view/Extension/GoogleAppsIntegration#installation

[polx]

Ok. I've been bitten by the uncertainty of prog-rights and, it seems, xar-importing (&lt; in the xar became \< in the page content which yielded something that was not a comment anymore).

[polx]

Solved in 2.4-rc-9.