As stated above:
The Act, which dates from the penal times, was originally designed to prevent lawyers from bamboozling both plaintiffs and defendants in Irish courts, by arguing cases in Latin or legal French.
Only incidently did the Act forbid the use of Gaelic in legal proceedings, but this now appears to be the Act's only residual function.
This is an injustice to the Gaelic language community of Northern Ireland and has the effect of alienating the Gaelic community from the mechanisms of the state.
This alienation might have been consistent with the philosophy of the ruling classes during the penal times but is completely at odds, not only with the notion of civil rights in the 21st century, but with the multi-linguistic and multi-cultural Celtic heritage of the British Isles.
There has been a Gaelic language community in Ulster from time immemorial and the use of the Gaelic language in legal proceedings in Northern Ireland should be authorised by Parliament.