The file my-evolution/metar.c contains non-ascii characters that causes
many warnings from xgettext when I update the sv.po (which is in UTF-8)
with "intltool-update sv":


msgmerge: warning: The following msgid contains non-ASCII characters.
                   This will cause problems to translators who use a 
                   character encoding different from yours. Consider
                   using a pure ASCII msgid instead.
                   °F
msgmerge: warning: The following msgid contains non-ASCII characters.
                   This will cause problems to translators who use a
                   character encoding different from yours. Consider
                   using a pure ASCII msgid instead.
                   °C


Also, the character (°) will not be displayed in the msgids in the po file,
it will simply be an extra space. Thus, these messages cannot be translated
correctly as they are, and causes the above warnings with gettext 0.11 and
newer, and possibly also other gettexts.

As for possible solutions, either:

1) use the string "degrees" or similar in the msgid instead, or
2) keep ° but un-mark this message for translation (if you are sure it
doesn't need localization).