Manage version configurations client versions (#7220)

* Add config values for client versions. Return client versions in ping response.

* Manage client version through System Console.

* Added client versions to diagnostics

* Added translations messages en.json file.

* Hide Client Versions on System Console.

webapp/i18n/en.json

@@ -150,6 +150,18 @@
   "admin.authentication.oauth": "OAuth 2.0",
   "admin.authentication.saml": "SAML 2.0",
   "admin.banner.heading": "Note:",
+  "admin.client_versions.androidLatestVersion": "Latest Android Version",
+  "admin.client_versions.androidLatestVersionHelp": "The latest released Android version",
+  "admin.client_versions.androidMinVersion": "Minimum Android Version",
+  "admin.client_versions.androidMinVersionHelp": "The minimum compliant Android version",
+  "admin.client_versions.desktopLatestVersion": "Latest Desktop Version",
+  "admin.client_versions.desktopLatestVersionHelp": "The latest released Desktop version",
+  "admin.client_versions.desktopMinVersion": "Minimum Destop Version",
+  "admin.client_versions.desktopMinVersionHelp": "The minimum compliant Desktop version",
+  "admin.client_versions.iosLatestVersion": "Latest IOS Version",
+  "admin.client_versions.iosLatestVersionHelp": "The latest released IOS version",
+  "admin.client_versions.iosMinVersion": "Minimum IOS Version",
+  "admin.client_versions.iosMinVersionHelp": "The minimum compliant IOS version",
   "admin.cluster.enableDescription": "When true, Mattermost will run in High Availability mode. Please see <a href=\"http://docs.mattermost.com/deployment/cluster.html\" target='_blank'>documentation</a> to learn more about configuring High Availability for Mattermost.",
   "admin.cluster.enableTitle": "Enable High Availability Mode:",
   "admin.cluster.interNodeListenAddressDesc": "The address the server will listen on for communicating with other servers.",
@@ -858,6 +870,7 @@
   "admin.sidebar.advanced": "Advanced",
   "admin.sidebar.audits": "Compliance and Auditing",
   "admin.sidebar.authentication": "Authentication",
+  "admin.sidebar.client_versions": "Client Versions",
   "admin.sidebar.cluster": "High Availability",
   "admin.sidebar.compliance": "Compliance",
   "admin.sidebar.configuration": "Configuration",