SubhanALLAAHi wa bi hamdihi, SubhanALLAAHi l azeem
(Glory to ALLAAH and His is the praise, Glory to ALLAAH, The Exalted)
In general while khutah is going on everyone must silent so-much-so that
It was narrated from Abu Hurayrah that the Prophet (peace and blessings of Allaah be upon him) said: “If you say to your companion when the imam is preaching on Friday, ‘Be quiet and listen,’ you have engaged in idle talk.”
(Narrated by al-Bukhaari, 892; Muslim, 851).
Even if you say to someone who is talking during kutbah to “be quiet” you yourself have engaged in idle talk. That means you must listen attentively what kateeb says. But this case is exception because of necessity
Lord, The Most says
“…But if one is forced by necessity, without wilful disobedience, nor transgressing due limits,- then is he guiltless. For Allah is Oft-forgiving Most Merciful.” Qur’an-(2/173)
So there is nothing wrong using translator to understand what kateeb says in khutbah.
ALLAAH knows best