Updates extensions store link language on the extensions page. Adds

link to the store even if there are installed extensions.

Fixes brave/brave-browser#2497
Fixes brave/brave-browser#1013

app/brave_generated_resources.grd

@@ -327,6 +327,10 @@ By installing this extension, you are agreeing to the Google Widevine Terms of U
       <message name="IDS_SETTINGS_BRAVE_SYNC_LINK_LABEL" desc="Brave Sync link label">
         Access Brave Sync via
       </message>
+      <!-- Extensions page strings -->
+      <message name="IDS_MD_EXTENSIONS_BRAVE_MORE_EXTENSIONS" desc="The message shown to the user on the Extensions settings page under the list of installed extensions.">
+        <ph name="BEGIN_LINK">&lt;a target="_blank" href="https://chrome.google.com/webstore/category/extensions"&gt;</ph>Looking for even more extensions?<ph name="END_LINK">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>
+      </message>
     </messages>
     <includes>
       <include name="IDR_BRAVE_TAG_SERVICES_POLYFILL" file="resources/js/tag_services_polyfill.js" type="BINDATA" />

app/md_extensions_strings.grdp

@@ -173,8 +173,8 @@
   <message name="IDS_MD_EXTENSIONS_ITEM_EXTENSION_WEBSITE" desc="Label for button to go to the website the extension developer specified.">
     Open extension website
   </message>
-  <message name="IDS_MD_EXTENSIONS_ITEM_CHROME_WEB_STORE" desc="Label for button to visit the Brave web store.">
-    View in Brave Web Store
+  <message name="IDS_MD_EXTENSIONS_ITEM_CHROME_WEB_STORE" desc="Label for button to visit the Web Extensions Store.">
+    View in Web Extensions Store
   </message>
   <message name="IDS_MD_EXTENSIONS_ITEM_OPTIONS" desc="The label on the button to open an extension options page.">
     Extension options
@@ -200,8 +200,8 @@
   <message name="IDS_MD_EXTENSIONS_ITEM_SOURCE_UNPACKED" desc="The text to indicate that an extension is loaded as an unpacked extension, as is done by developers.">
     Unpacked extension
   </message>
-  <message name="IDS_MD_EXTENSIONS_ITEM_SOURCE_WEBSTORE" desc="The text to indicate that an extension is from the Brave Web Store.">
-    Brave Web Store
+  <message name="IDS_MD_EXTENSIONS_ITEM_SOURCE_WEBSTORE" desc="The text to indicate that an extension is from the Web Extensions Store.">
+    Web Extensions Store
   </message>
   <message name="IDS_MD_EXTENSIONS_ITEM_VERSION" desc="The label above an extension's version.">
     Version
@@ -222,7 +222,7 @@
     Retry
   </message>
   <message name="IDS_MD_EXTENSIONS_NO_INSTALLED_ITEMS" desc="The message shown to the user on the Extensions settings page when there are no extensions or apps installed.">
-    Find extensions and themes in the <ph name="BEGIN_LINK">&lt;a target="_blank" href="https://chrome.google.com/webstore/category/extensions"&gt;</ph>Brave Web Store<ph name="END_LINK">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>
+    You don't have any extensions yet. Would you like to <ph name="BEGIN_LINK">&lt;a target="_blank" href="https://chrome.google.com/webstore/category/extensions"&gt;</ph>install some<ph name="END_LINK">&lt;/a&gt;<ex>&lt;/a&gt;</ex></ph>?
   </message>
   <message name="IDS_MD_EXTENSIONS_NO_DESCRIPTION" desc="The message shown to the user when an extension does not have any description.">
     No description provided

chromium_src/chrome/browser/ui/webui/extensions/extensions_ui.cc

@@ -0,0 +1,29 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "brave/grit/brave_generated_resources.h"
+#include "content/public/browser/web_ui_data_source.h"
+
+// Forward declarations needed due to extensions_ui.cc being patched with this
+// function name.
+namespace extensions {
+namespace {
+void BraveAddLocalizedStrings(content::WebUIDataSource* html_source);
+} // namespace
+} // namespace extensions
+
+#include "../../../../../../chrome/browser/ui/webui/extensions/extensions_ui.cc"
+
+namespace extensions {
+
+namespace {
+
+void BraveAddLocalizedStrings(content::WebUIDataSource* html_source) {
+  html_source->AddLocalizedString("moreExtensions",
+    IDS_MD_EXTENSIONS_BRAVE_MORE_EXTENSIONS);
+}
+
+} // namespace
+
+} // namespace extensions

patches/chrome-browser-resources-md_extensions-item_list.html.patch

@@ -0,0 +1,18 @@
+diff --git a/chrome/browser/resources/md_extensions/item_list.html b/chrome/browser/resources/md_extensions/item_list.html
+index 90244de120cf8fda71002f535810619b1e8aeb3e..84450aca34abf7b55e1289b8716b81d5323e6ec0 100644
+--- a/chrome/browser/resources/md_extensions/item_list.html
++++ b/chrome/browser/resources/md_extensions/item_list.html
+@@ -106,6 +106,13 @@
+             </template>
+           </div>
+         </div>
++        <div id="more-items" class="empty-list-message" style="margin-top: 32px;"
++            hidden$="[[shouldShowEmptyItemsMessage_(
++                apps.length, extensions.length)]]">
++          <span>
++            $i18nRaw{moreExtensions}
++          </span>
++        </div>
+       </div>
+     </div>
+   </template>

patches/chrome-browser-ui-webui-extensions-extensions_ui.cc.patch

@@ -0,0 +1,12 @@
+diff --git a/chrome/browser/ui/webui/extensions/extensions_ui.cc b/chrome/browser/ui/webui/extensions/extensions_ui.cc
+index 393653d66928e306bfdf479d6e0fd194655e783c..cc330c1194b80b775e4de82c19d7aa373b8f2270 100644
+--- a/chrome/browser/ui/webui/extensions/extensions_ui.cc
++++ b/chrome/browser/ui/webui/extensions/extensions_ui.cc
+@@ -348,6 +348,7 @@ ExtensionsUI::ExtensionsUI(content::WebUI* web_ui) : WebUIController(web_ui) {
+       base::Bind(&ExtensionsUI::OnDevModeChanged, base::Unretained(this)));
+
+   source = CreateMdExtensionsSource(*in_dev_mode_);
++  BraveAddLocalizedStrings(source);
+
+ #if defined(OS_CHROMEOS)
+   auto kiosk_app_handler = std::make_unique<chromeos::KioskAppsHandler>(