Text to display with open source URLs when Crostini is installed

Bug: 858832
Change-Id: I959d55b8fe6cbc143d494c236b6fca46d82c4807
Reviewed-on: https://chromium-review.googlesource.com/1142852
Commit-Queue: Renée Wright <rjwright@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576411}

chrome/app/chromium_strings.grd

@@ -219,6 +219,9 @@ If you update this file, be sure also to update google_chrome_strings.grd. -->
         <message name="IDS_ABOUT_CROS_VERSION_LICENSE" desc="Additional text displayed beneath the Chromium open source URLs for Chrome OS.">
           Chromium OS is made possible by additional <ph name="BEGIN_LINK_CROS_OSS">&lt;a target="_blank" href="$1"&gt;</ph>open source software<ph name="END_LINK_CROS_OSS">&lt;/a&gt;</ph>.
         </message>
+        <message name="IDS_ABOUT_CROS_WITH_LINUX_VERSION_LICENSE" desc="Additional text displayed beneath the Chromium open source URLs for Chrome OS when Crostini is installed.">
+          Chrome OS is made possible by additional <ph name="BEGIN_LINK_CROS_OSS">&lt;a target="_blank" href="$1"&gt;</ph>open source software<ph name="END_LINK_CROS_OSS">&lt;/a&gt;</ph>, as is Linux (Beta).
+        </message>
       </if>
       <message name="IDS_ABOUT_TERMS_OF_SERVICE" desc="The terms of service label in the About box." translateable="false">
         Not used in Chromium. Placeholder to keep resource maps in sync. It expects one argument: <ph name="ARGUMENT">$1</ph>.

chrome/app/google_chrome_strings.grd

@@ -225,6 +225,9 @@ chromium_strings.grd. -->
         <message name="IDS_ABOUT_CROS_VERSION_LICENSE" desc="Additional text displayed beneath the Chromium open source URLs for Chrome OS.">
           Chrome OS is made possible by additional <ph name="BEGIN_LINK_CROS_OSS">&lt;a target="_blank" href="$1"&gt;</ph>open source software<ph name="END_LINK_CROS_OSS">&lt;/a&gt;</ph>.
         </message>
+        <message name="IDS_ABOUT_CROS_WITH_LINUX_VERSION_LICENSE" desc="Additional text displayed beneath the Chromium open source URLs for Chrome OS when Crostini is installed.">
+          Chrome OS is made possible by additional <ph name="BEGIN_LINK_CROS_OSS">&lt;a target="_blank" href="$1"&gt;</ph>open source software<ph name="END_LINK_CROS_OSS">&lt;/a&gt;</ph>, as is Linux (Beta).
+        </message>
         <message name="IDS_ABOUT_TERMS_OF_SERVICE" desc="The terms of service label in the About box.">
           Google Chrome OS <ph name="TERMS_OF_SERVICE_LINK">&lt;a target="_blank" href="$1"&gt;</ph>Terms of Service<ph name="END_TERMS_OF_SERVICE_LINK">&lt;/a&gt;</ph>
         </message>