A simple conformity check:
gtgrep -cn --msgstr '\.\.\.' filename.po
I had a bit of a battle to get the regex escapes right in bash, but
this should weed out most false positives:
gtgrep -cn --msgstr '(?<!\.)\.\.\.(?!\.)' filename.po
However if the translation uses "...." or ".." when it should really
be using an ellipsis, the first form is better anyway, or maybe
(?<!\.)\.{2,4}(?!\.). Probably it's best just to use the simple one
:)
(gtgrep comes from pyg3t)
Something similar could be done for the other characters, but of
course quotation marks vary a lot depending on language, so it would
not all be completely portable to all languages.