Add unknown_errors

Author: SpEcHiDe

compiler/errors/source/400_BAD_REQUEST.tsv

@@ -61,6 +61,7 @@ BROADCAST_REQUIRED	The request can only be used with a channel
 BUSINESS_PEER_INVALID	Messages can't be set to the specified peer through the current [business connection](https://core.telegram.org/api/business#connected-bots).
 BUSINESS_PEER_USAGE_MISSING	You cannot send a message to a user through a [business connection](https://core.telegram.org/api/business#connected-bots) if the user hasn't recently contacted us.
 BUSINESS_RECIPIENTS_EMPTY	You didn't set any flag in inputBusinessBotRecipients, thus the bot cannot work with *any* peer.
+BUSINESS_RECIPIENTS_INVALID	The specified inputBusinessBotRecipients is invalid.
 BUSINESS_WORK_HOURS_EMPTY	No work hours were specified.
 BUSINESS_WORK_HOURS_PERIOD_INVALID	The specified work hours are invalid, see [here »](https://core.telegram.org/api/business#opening-hours) for the exact requirements.
 BUTTON_COPY_TEXT_INVALID	The `copy_text` of one or more of the buttons you provided is invalid.