fdo#83308 Show thousand separators in document word/character counts

Change-Id: I7ef59f3c40c475c25dd6f110f298fcda3f0f1079
Reviewed-on: https://gerrit.libreoffice.org/12130
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>