Use "Brave Authors" in copyright statements (fixes brave/brave-browser#6883)

Author: fmarier

android/java/strings/android_chrome_strings.grd

@@ -1482,7 +1482,7 @@ Your Brave account may have other forms of browsing history like searches and ac
         About Brave
       </message>
       <message name="IDS_LEGAL_INFORMATION_SUMMARY" desc="Summary for legal information" meaning="Android">
-        Copyright © <ph name="year">%1$d<ex>2014</ex></ph> Brave Software Inc. All rights reserved.
+        Copyright © <ph name="year">%1$d<ex>2014</ex></ph> The Brave Authors. All rights reserved.
       </message>
       <message name="IDS_APPLICATION_VERSION_TITLE" desc="Title for application version">
         Application version

app/brave_strings.grd

@@ -209,7 +209,7 @@ If you update this file, be sure also to update google_chrome_strings.grd. -->
         Brave Software Inc
       </message>
       <message name="IDS_ABOUT_VERSION_COPYRIGHT" desc="Copyright information on the about pages">
-        Copyright © <ph name="YEAR">{0,date,y}<ex>2016</ex></ph> Brave Software Inc. All rights reserved.
+        Copyright © <ph name="YEAR">{0,date,y}<ex>2016</ex></ph> The Brave Authors. All rights reserved.
       </message>
       <if expr="chromeos">
         <message name="IDS_ABOUT_CROS_VERSION_LICENSE" desc="Additional text displayed beneath the Brave open source URLs for Brave OS.">