362 fix retention size label (#372)

Fixes #362 


### Verifying this change

- [x] Make sure that the change passes the `./gradlew build` checks.


diff --git a/front-end/src/lang/en.js b/front-end/src/lang/en.js
index 3e87161..23f566e 100644
--- a/front-end/src/lang/en.js
+++ b/front-end/src/lang/en.js
@@ -407,7 +407,7 @@
       messageTTLContent: 'Set message TTL in seconds. If the messages are not consumed by any consumers' +
         ' of a subscription, they are marked as `consumed` after the configured TTL period for that subscription.',
       inputMessageTTL: 'Please input Backlog Quotas Limit',
-      retentionSize: 'Retention Size (bytes)',
+      retentionSize: 'Retention Size (megabytes)',
       retentionSizeContent: 'The retention size. Only applied to the messages are acknowledged by all subscriptions.',
       inputRententionSize: 'Please input retention size',
       retentionTime: 'Retention Period (minutes)',
diff --git a/front-end/src/lang/zh.js b/front-end/src/lang/zh.js
index 304ddd0..bbec239 100644
--- a/front-end/src/lang/zh.js
+++ b/front-end/src/lang/zh.js
@@ -407,7 +407,7 @@
       messageTTLContent: 'Set message TTL in seconds. If the messages are not consumed by any consumers' +
         ' of a subscription, they are marked as `consumed` after the configured TTL period for that subscription.',
       inputMessageTTL: 'Please input Backlog Quotas Limit',
-      retentionSize: 'Retention Size (bytes)',
+      retentionSize: 'Retention Size (megabytes)',
       retentionSizeContent: 'The retention size. Only applied to the messages are acknowledged by all subscriptions.',
       inputRententionSize: 'Please input retention size',
       retentionTime: 'Retention Period (minutes)',