* po/POTFILES.in
* src/addressbook.c
* src/compose.c
* src/filtering.c
* src/headerview.c
* src/matcher.c
* src/prefs_common.c
* src/prefs_common.h
* src/prefs_display_header.c
* src/prefs_matcher.c
* src/summaryview.c
* src/gtk/headers.h
* src/gtk/quicksearch.c
Translate more header names according to the relevant option value,
mostly in filtering debug messages (reported by Tim <timbrain@post.cz>).
Replaced nearly all uses of prefs_common.trans_hdr with a call
to prefs_common_translated_header_name().
Added a headers.h reference file that contains known header names
(RFC2822 and others) to the translation process' input, so that
translated header names will still exist even if no occurrence of
_("headername") is found anymore in the sources.
Don't translate column name 'Number' following to trans_hdr option
value as it's not a header name.
351b1b34f7