minor spelling mistakes

[umlaeute]

i just installed SerialTest and haven't actually tested in, but the first thing i noticed is, that there are a few spelling mistakes:

bad	good
Sended	Sent
Successed	Success

a quick search didn't show any other errors :-)

(I know this is minor and nitpicky, but reading Sended really makes me nervous :-))

[umlaeute]

alternatively you could enable a (pseudo-) English translation (of the original English terms), and I would submit a weblate translation.
(but I guess it is easier to just fix the source string and do a search-and-replace in the translation files)