[Touchless]: Update center apps icon title from "All apps" to "Explore apps"

(cherry picked from commit 656e94d7bb292f2f2421cd3d355f71f445a1994a)

Bug: 974122
Change-Id: Ia4ce2d08fc5c6952864ed2667db1bbe03e5ab863
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1660019
Reviewed-by: Sky Malice <skym@chromium.org>
Commit-Queue: Cathy Li <chili@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#669282}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1661189
Reviewed-by: Cathy Li <chili@chromium.org>
Cr-Commit-Position: refs/branch-heads/3809@{#323}
Cr-Branched-From: d82dec1a818f378c464ba307ddd9c92133eac355-refs/heads/master@{#665002}

diff --git a/chrome/android/touchless/java/strings/touchless_strings.grd b/chrome/android/touchless/java/strings/touchless_strings.grd
index 6e25b9f..366ce5a 100644
--- a/chrome/android/touchless/java/strings/touchless_strings.grd
+++ b/chrome/android/touchless/java/strings/touchless_strings.grd

@@ -126,7 +126,7 @@
         Now
       </message>
       <message name="IDS_NTP_ALL_APPS" desc="Text to accompany icon that will navigate to a page showing a categorized view of different applications or sites">
-        All apps
+        Explore apps
       </message>
       <message name="IDS_MORE_ARTICLES" desc="Message at the bottom of a list of news items prompting the user to load more.">
         More articles