Localization different than English is not supported

[cz6ace]

Describe the bug
The library expects the LANG is us or C, looking for English patterns in gpg output.

To Reproduce
Steps to reproduce the behavior:

1. Set-up locale different than en_us, e.g. cs_CZ.UTF-8
2. run pytest
3. some tests are failing, like get_recipients_file that is using PUBLIC_KEY_RE = re.compile(r'gpg: public key is (\w+)')

Expected behavior
Library is not dependent on locale, may be injecting LANG=C into the executed process

Environment

• Windows 11, cygwin
• Version of this library: 0.5.6
• Version of GnuPG: gpg (GnuPG) 2.5.21-unknown

Screenshot

See .stderr does not contain expected "...public key is..." but localized message