Update displayStrings.properties

common/src/main/resources/i18n/displayStrings.properties

@@ -1104,7 +1104,7 @@ You can find the correct transaction by opening the trade details window (click
  and following the trading fee payment transaction output to the next transaction where you see \
 the Multisig deposit transaction (the address starts with 3). That transaction ID should be \
 visible in the list presented here. Once you found the correct transaction select that transaction here and continue.\n\n\
-Sorry for the inconvenience but that error case should be happen very rare and in future we will try \
+Sorry for the inconvenience but that error case should happen very rarely and in future we will try \
 to find better ways to resolve it.
 selectDepositTxWindow.select=Select deposit transaction