support custom wei

ui/blocks/utils.ts

 import getValueWithUnit from 'lib/getValueWithUnit';
+import { currencyUnits } from 'lib/units';
 
 export const getBaseFeeValue = (baseFee: string | null) => {
   if (!baseFee) {
@@ -6,7 +7,7 @@ export const getBaseFeeValue = (baseFee: string | null) => {
   }
   const valGwei = getValueWithUnit(baseFee, 'gwei');
   if (valGwei.isGreaterThanOrEqualTo(0.0001)) {
-    return valGwei.toFormat(4) + ' Gwei';
+    return `${ valGwei.toFormat(4) } ${ currencyUnits.gwei }`;
   }
-  return getValueWithUnit(baseFee, 'wei').toFormat() + ' wei';
+  return `${ getValueWithUnit(baseFee, 'wei').toFormat() } ${ currencyUnits.wei }`;
 };