wt-status: take the alignment burden off translators

wt-status: take the alignment burden off translators

It's not easy for translators to see spaces in these strings have to
align, especially when there are no guarantees that these strings are
grouped together in .po files. Refactor the code and do the alignment
automatically.

Noticed-by: Wolfgang Rohdewald <wolfgang@rohdewald.de>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>