The wikibase-time-precision-* messages have unclear context and documentation.

"in $1 billion years" can be used in the phrases "$1 billion years *from now*", "*once* in $1 billion years", "in units of $1 billion years", etc. The current documentation doesn't make it clear what is the required sense. The qqq strings must be updated to reflect this.

Furthermore, I suspect that the full stop is not needed in English in "$1. millennium" and "$1. century". If I'm not mistaken, a full stop is needed after numbers in some languages in some cases, but it's not needed in English. I might be wrong in my suspicion, but in any case this must be clarified in qqq.

Finally, the message Wikibase-time-precision-century is extremely unclear. Is "$1s" really a good string for English?

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