ReadonlylanguageThe host's display language, as a BCP 47 tag ('en', 'ja-JP', ...).
ReadonlyrequestedEvery message asked for, in order, before placeholders were filled.
Adds bundle entries, keyed by the source message the code passes to t.
A message with no entry falls through untranslated, as VS Code's own
bundle lookup does. Translator comments are still recorded in requested
but do not form a second lookup key in this focused fake.
Switches the reported display language.
Looks a message up in the host's bundle, filling in its placeholders.
In-memory localization capability for tests.