Add info box to Remote Path Mappings Settings

(cherry picked from commit d8f3d7d3eafeafd8d4372db0076a63f935a29218)

Closes #4035

frontend/src/Settings/DownloadClients/RemotePathMappings/RemotePathMappings.js

@@ -1,10 +1,12 @@
 import PropTypes from 'prop-types';
 import React, { Component } from 'react';
+import Alert from 'Components/Alert';
 import FieldSet from 'Components/FieldSet';
 import Icon from 'Components/Icon';
 import Link from 'Components/Link/Link';
+import InlineMarkdown from 'Components/Markdown/InlineMarkdown';
 import PageSectionContent from 'Components/Page/PageSectionContent';
-import { icons } from 'Helpers/Props';
+import { icons, kinds } from 'Helpers/Props';
 import translate from 'Utilities/String/translate';
 import EditRemotePathMappingModalConnector from './EditRemotePathMappingModalConnector';
 import RemotePathMapping from './RemotePathMapping';
@@ -50,6 +52,11 @@ class RemotePathMappings extends Component {
           errorMessage={translate('UnableToLoadRemotePathMappings')}
           {...otherProps}
         >
+
+          <Alert kind={kinds.INFO}>
+            <InlineMarkdown data={translate('RemotePathMappingsInfo', { app: 'Lidarr', wikiLink: 'https://wiki.servarr.com/lidarr/settings#remote-path-mappings' })} />
+          </Alert>
+
           <div className={styles.remotePathMappingsHeader}>
             <div className={styles.host}>
               {translate('Host')}

src/NzbDrone.Core/Localization/Core/en.json

@@ -759,6 +759,7 @@
   "RemotePathMappingCheckRemoteDownloadClient": "Remote download client {0} reported files in {1} but this directory does not appear to exist.  Likely missing remote path mapping.",
   "RemotePathMappingCheckWrongOSPath": "Remote download client {0} places downloads in {1} but this is not a valid {2} path.  Review your remote path mappings and download client settings.",
   "RemotePathMappings": "Remote Path Mappings",
+  "RemotePathMappingsInfo": "Remote Path Mappings are very rarely required, if {app} and your download client are on the same system it is better to match your paths. For more information see the [wiki]({wikiLink})",
   "Remove": "Remove",
   "RemoveCompleted": "Remove Completed",
   "RemoveCompletedDownloads": "Remove Completed Downloads",