fix(iOS-mailto): Send no new line invite on default email

- addresses this issue: https://developer.apple.com/forums/thread/681023

lang/main.json

         "invitePhone": "To join by phone instead, tap this: {{number}},,{{conferenceID}}#\n",
         "invitePhoneAlternatives": "Looking for a different dial-in number?\nSee meeting dial-in numbers: {{url}}\n\n\nIf also dialing-in through a room phone, join without connecting to audio: {{silentUrl}}",
         "inviteSipEndpoint": "To join using the SIP address, enter this: {{sipUri}}",
+        "inviteTextiOSPersonal": "{{name}} is inviting you to a meeting.",
+        "inviteTextiOSJoinSilent": "If you are dialing-in through a room phone, use this link to join without connecting to audio: {{silentUrl}}.",
+        "inviteTextiOSInviteUrl": "Click the following link to join: {{inviteUrl}}.",
+        "inviteTextiOSPhone": "To join via phone, use this number: {{number}},,{{conferenceID}}#. If you are looking for a different number, this is the full list: {{didUrl}}.",
         "inviteURLFirstPartGeneral": "You are invited to join a meeting.",
         "inviteURLFirstPartPersonal": "{{name}} is inviting you to a meeting.\n",
         "inviteURLSecondPart": "\nJoin the meeting:\n{{url}}\n",

react/features/invite/components/add-people-dialog/web/AddPeopleDialog.js

 import {
     _getDefaultPhoneNumber,
     getInviteText,
+    getInviteTextiOS,
     isAddPeopleEnabled,
     isDialOutEnabled,
     sharingFeatures,
      */
     _invitationText: string,
 
+    /**
+     * The custom no new-lines meeting invitation text for iOS default email.
+     * Needed because of this mailto: iOS issue: https://developer.apple.com/forums/thread/681023
+     */
+    _invitationTextiOS: string,
+
     /**
      * An alternate app name to be displayed in the email subject.
      */
     _urlSharingVisible,
     _emailSharingVisible,
     _invitationText,
+    _invitationTextiOS,
     _inviteAppName,
     _inviteContactsVisible,
     _inviteUrl,
                     _emailSharingVisible
                         ? <InviteByEmailSection
                             inviteSubject = { inviteSubject }
-                            inviteText = { _invitationText } />
+                            inviteText = { _invitationText }
+                            inviteTextiOS = { _invitationTextiOS } />
                         : null
                 }
                 { _embedMeetingVisible && <EmbedMeetingTrigger /> }
         _invitationText: getInviteText({ state,
             phoneNumber,
             t: ownProps.t }),
+        _invitationTextiOS: getInviteTextiOS({ state,
+            phoneNumber,
+            t: ownProps.t }),
         _inviteAppName: inviteAppName,
         _inviteContactsVisible: interfaceConfig.ENABLE_DIAL_OUT && !hideInviteContacts,
         _inviteUrl: getInviteURL(state),

react/features/invite/components/add-people-dialog/web/InviteByEmailSection.js

 
 import React, { useState } from 'react';
 
+import { isIosMobileBrowser } from '../../../../base/environment/utils';
 import { translate } from '../../../../base/i18n';
 import {
     Icon,
      */
     inviteText: string,
 
+    /**
+     * The encoded no new-lines iOS invitation text to be sent on default mail.
+     */
+    inviteTextiOS: string,
+
     /**
      * Invoked to obtain translated strings.
      */
  *
  * @returns {React$Element<any>}
  */
-function InviteByEmailSection({ inviteSubject, inviteText, t }: Props) {
+function InviteByEmailSection({ inviteSubject, inviteText, inviteTextiOS, t }: Props) {
     const [ isActive, setIsActive ] = useState(false);
     const encodedInviteSubject = encodeURIComponent(inviteSubject);
     const encodedInviteText = encodeURIComponent(inviteText);
+    const encodedInviteTextiOS = encodeURIComponent(inviteTextiOS);
+
+    const encodedDefaultEmailText = isIosMobileBrowser() ? encodedInviteTextiOS : encodedInviteText;
 
     /**
      * Copies the conference invitation to the clipboard.
             {
                 icon: IconEmail,
                 tooltipKey: 'addPeople.defaultEmail',
-                url: `mailto:?subject=${encodedInviteSubject}&body=${encodedInviteText}`
+                url: `mailto:?subject=${encodedInviteSubject}&body=${encodedDefaultEmailText}`
             },
             {
                 icon: IconGoogle,

react/features/invite/functions.js

 import { getActiveSession } from '../../features/recording/functions';
 import { getRoomName } from '../base/conference';
 import { getInviteURL } from '../base/connection';
+import { isIosMobileBrowser } from '../base/environment/utils';
 import { i18next } from '../base/i18n';
 import { JitsiRecordingConstants } from '../base/lib-jitsi-meet';
 import { getLocalParticipant, isLocalParticipantModerator } from '../base/participants';
         });
 }
 
+/**
+ * Creates a custom no new lines message for iOS default mail describing how to dial in to the conference.
+ *
+ * @returns {string}
+ */
+export function getInviteTextiOS({
+    state,
+    phoneNumber,
+    t
+}: Object) {
+    if (!isIosMobileBrowser()) {
+        return '';
+    }
+
+    const dialIn = state['features/invite'];
+    const inviteUrl = getInviteURL(state);
+    const localParticipant = getLocalParticipant(state);
+    const localParticipantName = localParticipant?.name;
+
+    const inviteURL = _decodeRoomURI(inviteUrl);
+
+    let invite = localParticipantName
+        ? t('info.inviteTextiOSPersonal', { name: localParticipantName })
+        : t('info.inviteURLFirstPartGeneral');
+
+    invite += ' ';
+
+    invite += t('info.inviteTextiOSInviteUrl', { inviteUrl });
+    invite += ' ';
+
+    if (shouldDisplayDialIn(dialIn)) {
+        invite += t('info.inviteTextiOSPhone', {
+            number: phoneNumber,
+            conferenceID: dialIn.conferenceID,
+            didUrl: getDialInfoPageURL(state)
+        });
+    }
+    invite += ' ';
+    invite += t('info.inviteTextiOSJoinSilent', { silentUrl: `${inviteURL}#config.startSilent=true` });
+
+    return invite;
+}
+
 /**
  * Creates a message describing how to dial in to the conference.
  *
     const localParticipantName = localParticipant?.name;
 
     const inviteURL = _decodeRoomURI(inviteUrl);
-
     let invite = localParticipantName
         ? t('info.inviteURLFirstPartPersonal', { name: localParticipantName })
         : t('info.inviteURLFirstPartGeneral');