l10n: sv.po: correct various translations

l10n: sv.po: correct various translations

- correct translation of pathspec msgs
  Corrects cases where the “pathspec” is translated as if it was a
  path
- correct translation of refspec msgs
  Corrects cases where the “refspec” were not consistently translated
- correct translation of credential msgs
  Corrects cases where the “credential” were not correctly translated

Signed-off-by: Stefan Björnelund <stefan.bjornelund.gnome@gmail.com>
Modified-by: Peter Krefting <peter@softwolves.pp.se>