Chore: Remove dead code related to billing (#935)

- remove subscription model
- remove billing-related code

app/javascript/dashboard/i18n/locale/en/agentMgmt.json

@@ -3,7 +3,7 @@
     "HEADER": "Agents",
     "HEADER_BTN_TXT": "Add Agent",
     "LOADING": "Fetching Agent List",
-    "SIDEBAR_TXT": "<p><b>Agents</b></p> <p> An <b>Agent</b> is a member of your Customer Support team. </p><p> Agents will be able to view and reply to messages from your users. The list shows all agents currently in your account. </p><p> Click on <b>Add Agent</b> to add a new agent. Agent you add will receive an email with a confirmation link to activate their account, after which they can access Chatwoot and respond to messages. </p><p> Access to Chatwoot's features are based on following roles. </p><p> <b>Agent</b> - Agents with this role can only access inboxes, reports and conversations. They can assign conversations to other agents or themselves and resolve conversations.</p><p> <b>Administrator</b> - Administrator will have access to all Chatwoot features enabled for your account, including settings and billing, along with all of a normal agents' privileges.</p>",
+    "SIDEBAR_TXT": "<p><b>Agents</b></p> <p> An <b>Agent</b> is a member of your Customer Support team. </p><p> Agents will be able to view and reply to messages from your users. The list shows all agents currently in your account. </p><p> Click on <b>Add Agent</b> to add a new agent. Agent you add will receive an email with a confirmation link to activate their account, after which they can access Chatwoot and respond to messages. </p><p> Access to Chatwoot's features are based on following roles. </p><p> <b>Agent</b> - Agents with this role can only access inboxes, reports and conversations. They can assign conversations to other agents or themselves and resolve conversations.</p><p> <b>Administrator</b> - Administrator will have access to all Chatwoot features enabled for your account, including settings, along with all of a normal agents' privileges.</p>",
     "AGENT_TYPES": [
       {
         "name": "administrator",

app/javascript/dashboard/i18n/locale/en/billing.json

@@ -1,19 +0,0 @@
-{
-  "BILLING": {
-    "HEADER": "Billing",
-    "LOADING": "Fetching Subscriptions",
-    "ACCOUNT_STATE": "Account State",
-    "AGENT_COUNT": "Agent Count",
-    "PER_AGENT_COST": "Per Agent Cost",
-    "TOTAL_COST": "Total Cost",
-    "BUTTON": {
-      "ADD": "Add Payment Method",
-      "EDIT": "EDIT Payment Method"
-    },
-    "TRIAL": {
-      "TITLE": "Your Trial period is over",
-      "MESSAGE": "Add a payment method to continue using Chatwoot."
-    },
-    "ACCOUNT_LOCKED": "Your account is not available at the moment. <br>Please contact your administrator for reactivation."
-  }
-}

app/javascript/dashboard/i18n/locale/en/index.js

@@ -1,6 +1,5 @@
 /* eslint-disable */
 import { default as _agentMgmt } from './agentMgmt.json';
-import { default as _billing } from './billing.json';
 import { default as _cannedMgmt } from './cannedMgmt.json';
 import { default as _chatlist } from './chatlist.json';
 import { default as _contact } from './contact.json';
@@ -17,7 +16,6 @@ import { default as _generalSettings } from './generalSettings.json';
 
 export default {
   ..._agentMgmt,
-  ..._billing,
   ..._cannedMgmt,
   ..._chatlist,
   ..._contact,

app/javascript/dashboard/i18n/locale/en/settings.json

@@ -102,7 +102,6 @@
     "AGENTS": "Agents",
     "INBOXES": "Inboxes",
     "CANNED_RESPONSES": "Canned Responses",
-    "BILLING": "Billing",
     "INTEGRATIONS": "Integrations",
     "ACCOUNT_SETTINGS": "Account Settings"
   }