move cookie banner copy to data file

_src/_data/gdpr.yml

@@ -10,3 +10,6 @@ newsletter: >
 
 
     We use MailChimp for our newsletter and by submitting this form, you acknowledge that the information you provide will be transferred to MailChimp for processing in accordance with their their [Terms](https://mailchimp.com/legal/terms/) and [Privacy Policy](https://mailchimp.com/legal/privacy/).
+
+cookies: >
+    By continuing your visit to this site, you accept the use of cookies from Google Analytics so we can improve the site for you.

_src/_includes/cookie-banner.html

@@ -1,6 +1,6 @@
 <div class="cookie-banner" id="cookies-eu-banner" style="display: none;">
     <p>
-        By continuing your visit to this site, you accept the use of cookies from Google Analytics so we can improve the site for you.
+        {{ site.data.gdpr.cookies }}
         <a href="{% link privacy.md %}" id="cookies-eu-more">Read more</a>
     </p>
     <p>