[MM-1915] Add Deactivate Account - server side (#8699)

i18n/en.json

@@ -2750,6 +2750,22 @@
     "id": "api.templates.welcome_subject",
     "translation": "[{{ .SiteName }}] You joined {{ .ServerURL }}"
   },
+  {
+    "id": "api.templates.deactivate_subject",
+    "translation": "[{{ .SiteName }}] Your account at {{ .ServerURL }} has been deactivated"
+  },
+  {
+    "id": "api.templates.deactivate_body.title",
+    "translation": "Your account has been deactivated at {{ .ServerURL }}"
+  },
+  {
+    "id": "api.templates.deactivate_body.info",
+    "translation": "You deactivated your account on {{ .SiteURL }}.<br>If this change wasn't initiated by you or you want to reactivate your account, contact your system administrator."
+  },
+  {
+    "id": "api.user.send_deactivate_email_and_forget.failed.error",
+    "translation": "Failed to send the deactivate account email successfully"
+  },
   {
     "id": "api.user.activate_mfa.email_and_ldap_only.app_error",
     "translation": "MFA is not available for this account type"
@@ -3074,6 +3090,10 @@
     "id": "api.user.update_active.permissions.app_error",
     "translation": "You do not have the appropriate permissions"
   },
+  {
+    "id": "api.user.update_active.not_enable.app_error",
+    "translation": "You cannot deactivate yourself because this feature is not enabled. Please contact your System Administrator."
+  },
   {
     "id": "api.user.update_mfa.not_available.app_error",
     "translation": "MFA not configured or available on this server"