[Jbansal2]

Fixes #43.

For .mo files (GNU message catalogs), libmagic's detected type string
can include the gettext PO header's Project-Id-Version field verbatim,
e.g.:

GNU message catalog (little endian), revision 0.0, 349 messages, Project-Id-Version: django '%(datetime)s non se puido interpretar na zona hora horaria %(current_timezone)s; pode ser ambiguo ou non existir.'

That trailing part after Project-Id-Version: is free-form content taken
directly from inside the scanned file (translator comments, escaped
non-ASCII bytes, etc.), not structural type information, so it was
leaking into filetype_file and anything derived from it (as reported
against the two Django .mo files linked in the issue).

Change

In magic2._detect(), right after decoding and collapsing whitespace on
libmagic's raw output, strip any trailing Project-Id-Version: ... that
follows the structural GNU message catalog (...), revision X, N messages
description, via a regex matched only against that specific pattern so no
other file type strings are affected.

Tests

Added tests/test_magic2.py cases that exercise the stripping regex
directly against both leaked strings quoted in the issue (the plain-text
one and the escaped-byte one) and confirm unrelated type strings
(ASCII text, an ELF description) pass through unchanged.

Verification note

This sandbox doesn't have a working typecode-libmagic plugin install
(module import fails before even reaching this code, on an unrelated
plugincode entry-point issue in this environment), so I couldn't run
file_type() end-to-end against real .mo files here. I verified the
regex logic in isolation against the exact strings quoted in the issue
(including the escaped-byte example) and against unrelated type strings,
and the new tests encode that same verification so they'll run in CI.

[Jbansal2]

The run_code_checks (doc8) and top-level build failures aren't from this PR's diff — doc8 is failing on pre-existing trailing whitespace in CHANGELOG.rst line 8, introduced by the Bump version and CHANGELOG to v30.2.0 release commit (4795fee) that's already on main. All 6 platform test matrices (macOS 14/15, Ubuntu 22/24, Windows 2022/2025) pass with this change. Happy to also fix the CHANGELOG whitespace here if that's preferred, just didn't want to bundle an unrelated fix into this diff without asking.