fix typo and missing messages (#5902)

webapp/components/admin_console/webserver_mode_dropdown_setting.jsx

@@ -75,7 +75,7 @@ export default class WebserverModeDropdownSetting extends React.Component {
                 values={[
                     {value: 'gzip', text: Utils.localizeMessage('admin.webserverModeGzip', 'gzip')},
                     {value: 'uncompressed', text: Utils.localizeMessage('admin.webserverModeUncompressed', 'Uncompressed')},
-                    {value: 'disabled', text: Utils.localizeMessage('admin.webserverModeDiabled', 'Disabled')}
+                    {value: 'disabled', text: Utils.localizeMessage('admin.webserverModeDisabled', 'Disabled')}
                 ]}
                 label={
                     <FormattedMessage

webapp/components/backstage/components/backstage_list.jsx

@@ -21,7 +21,7 @@ export default class BackstageList extends React.Component {
     }
 
     static defaultProps = {
-        searchPlaceholder: Utils.localizeMessage('backstage.search', 'Search')
+        searchPlaceholder: Utils.localizeMessage('backstage_list.search', 'Search')
     }
 
     constructor(props) {

webapp/components/edit_channel_purpose_modal.jsx

@@ -71,7 +71,7 @@ export default class EditChannelPurposeModal extends React.Component {
             },
             (err) => {
                 if (err.id === 'api.context.invalid_param.app_error') {
-                    this.setState({serverError: Utils.localizeMessage('edit_channel_puropse_modal.error', 'This channel purpose is too long, please enter a shorter one')});
+                    this.setState({serverError: Utils.localizeMessage('edit_channel_purpose_modal.error', 'This channel purpose is too long, please enter a shorter one')});
                 } else {
                     this.setState({serverError: err.message});
                 }

webapp/components/signup/components/signup_ldap.jsx

@@ -115,7 +115,7 @@ export default class SignupLdap extends React.Component {
         if (global.window.mm_config.LdapLoginFieldName) {
             ldapIdPlaceholder = global.window.mm_config.LdapLoginFieldName;
         } else {
-            ldapIdPlaceholder = Utils.localizeMessage('login.ldap_username', 'AD/LDAP Username');
+            ldapIdPlaceholder = Utils.localizeMessage('login.ldapUsername', 'AD/LDAP Username');
         }
 
         let errorClass = '';