[mod] add 'Accept-Language' HTTP header to online processores

Most engines that support languages (and regions) use the Accept-Language from
the WEB browser to build a response that fits to the language (and region).

- add new engine option: send_accept_language_header

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/settings.yml

@@ -748,6 +748,7 @@ engines:
 
   - name: google play movies
     engine: xpath
+    send_accept_language_header: true
     search_url: https://play.google.com/store/search?q={query}&c=movies
     results_xpath: '//div[@class="ImZGtf mpg5gc"]'
     title_xpath: './/div[@class="RZEgze"]//div[@class="kCSSQe"]//a'