Giving the string " and " to transiflex seems to fail and/or
it's highly possible that the translators make a mistake by
translating it into "and" or " and" or "and ".
Change the string to "and" and hard code the whitespaces before and after.
Change O2 to O₂ in statistics.
Translate "He" and "O2" in statistics.
Signed-off-by: Stefan Fuchs <sfuchs@gmx.de>
a784b15cb8