Comma splices in two source strings (EN_US)

Can confirm in 21w08b.

Are you sure that these source strings are intended to be complete sentences? You suggested that the comma splice should be fixed by either replacing the comma with a semicolon or separating each clause into separate sentences. However, these suggestions still would not create perfect grammar because the clauses are not complete sentences. One way to write these source strings grammatically perfectly is...

The chat is disabled by a launcher option; the message cannot be sent.
The chat is not allowed by account settings; the message cannot be sent.

However, the current informal way that the source strings are written might be intended for the sake of brevity.

Whether complete sentences or not, commas used to separate two independent clauses are not correct. However, your point is one of the reasons I prefer the semicolon option to the period & capital option; the period in the middle would be strange without also adding one at the end.