Filename suffix pattern that identifies a translated sibling brief
(e.g. executive-brief_ar.md, synthesis-summary_zh.md). The
_<lang> token is matched against ALL_LANGUAGES so we never
exclude a legitimate English artefact whose name happens to end in
_<two-letter-suffix>.md.
Matching is case-insensitive to handle uppercase variants.
Filename suffix pattern that identifies a translated sibling brief (e.g.
executive-brief_ar.md,synthesis-summary_zh.md). The_<lang>token is matched against ALL_LANGUAGES so we never exclude a legitimate English artefact whose name happens to end in_<two-letter-suffix>.md.Matching is case-insensitive to handle uppercase variants.