Comment # 9 on bug 1227316 from Stanislav Brabec

Code inspection discovered that the header analysis code of
message_list_header_list() is inspired by message_list_delete_header_field() in
the same file. That one is apparently buggy as well.

For example:
message_list_delete_header_field(mlp, "Language") will delete not only
"Language" tag line, but also "Language-Team". The code does not contain the
check for ":" at the end of the tag.

Markéta attempted to write a better parser without identifying the bug in the
original code but failed as well.

The original bug remains undiscovered for years, as the function is used only
in some special XML files for deleting POT-Creation-Date. And available in
bindings.