The following reply has been copied from IBLF's previous home on Bravenet.
For a start the word unethical is unfortunate. It is either permitted or not permitted to talk in another language. It would only be unethical if it were nto permitted, the players knew it, and did it anyway.
In most events in English-speaking countries players are not permitted to speak in any language but English while the board is in play, but they may converse in their own language between hands. They should stop immediately one of thme takes the hands out of the board for their next hand [or, more technically correct, as soon as one of them looks at the face of one of his cards].
It is legal, however, for the sponsoring organisation to have other regulations, and it is known in international events for only English to be permitted during a playing session. If this is one of the Conditions of Contest then it must be adhered to, and it is a legal one.
Now, if there are no regulations in force at all, it would be normal to allow players to talk in other languages between hands but not to permit them during a hand unless the other side knew the language as well.
Now I shall comment on the specific quotes.
'It is at any time very unethical to talk in other language during or between hands at the table.' (local club director)
As I explained earlier it is not unethical, and is fairly normal between hands.
'When a foreign language is used, even if it is not when the bidding and play is in progress, but between hands, some members (players) are going to become very uncomfortable, because they don't now what is going on. This is clearly an unacceptable situation.' (local club official)
That is pure sefishness. This is the sort of attitude that has led to so much discrimination over the years. Would he ban braille cards if the player was blind saying it is unacceptable for his opponnets?
'The use of foreign language between boards is unacceptable.' ('legal authority in such matters')
Same reply: this is discriminatory and persecution.
While internationals are another matter, for ordinary club events to ban speaking in foreign languages between hands is at the same level as banning blacks or women because they make their opponents uncomfortable.
Nevertheless, it is a matter for regulation. In the absence of a regulation speaking in any way between hands is accepted. During hands is different because of the possibilities of illegal communication between partners.