support for handling keyserver urls from browser, added documentation

OpenKeychain/src/main/res/values/strings.xml

@@ -404,6 +404,9 @@
     <string name="import_qr_code_button">"Scan QR Code"</string>
     <string name="import_qr_code_text">"Place your camera over the QR Code!"</string>
 
+    <!-- Import from URL -->
+    <string name="import_url_warn_no_search_parameter">"No search parameter found. You may still attempt manually searching the keyserver."</string>
+
     <!-- Generic result toast -->
     <string name="view_log">"Details"</string>
     <string name="with_warnings">", with warnings"</string>