Remove unused i18n strings

[arunasurya]

It seems like this string is no longer referenced from the source code, so we should remove it (see the link below). It creates confusion for translators who think that it should be translated. We should probably review the strings to check that there are no unused ones in general to save unnecessary work for translators.

portfolio.pending.support.text.getHelp.arbitrator=If you have any problems you can try to contact the trade peer in the trade \
  chat or ask the Bisq community at https://bisq.community. \
  If your issue still isn't resolved, you can request more help from an arbitrator.

bisq/core/src/main/resources/i18n/displayStrings.properties

Line 793 in 5676841

portfolio.pending.support.text.getHelp.arbitrator=If you have any problems you can try to contact the trade peer in the trade \

[ripcurlx]

I'll run a check for all translations to remove every key that is not used anymore.

[niyid]

@ripcurlx
I had been unsure of the status (priority/importance) of this issue since it was listed for so long with no decoration. If you have not done it already, you may reassign to me.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically closed because of inactivity. Feel free to reopen it if you think it is still relevant.