tagstring translation via re.sub

this introduces a feature that lets you use regexps to match
tagstrings in your [tags] subsections.
Moreover, it introduces a config option "translation" for these sections that
will take a pair of strings as value and, if no "translation" is given,
will be used to substitute the matching tagstring to a translated string:

tag: "notmuch::foo",
section: "[[notmuch::.*]]"
translation: "notmuch::(.*)", "nm:\1"

will result in a translated tagstring "nm:foo"

0 files changed, 0 insertions, 0 deletions