Fix tags

news/2017/news-20170811-01.de.xhtml

@@ -127,7 +127,7 @@ schickst. Wir freuen uns darauf, Deine Bewerbung zu lesen!
 
 </body>
 <tags>
-  <tag content="internship">internship</tag>
+  <tag content="Praktikum">internship</tag>
   <tag>front-page</tag>
 </tags>
 <author id="oberg" />

news/2017/news-20170811-01.en.xhtml

@@ -131,7 +131,7 @@ contact@fsfe.org address. We look forward to reading your application!
 
 </body>
 <tags>
-  <tag content="internship">internship</tag>
+  <tag content="Internship">internship</tag>
   <tag>front-page</tag>
 </tags>
 <author id="oberg" />

news/2017/news-20170811-01.nl.xhtml

@@ -100,7 +100,7 @@ Beide zullen uw vraag lezen en antwoord geven als u uw vraag verzend naar contac
 
 </body>
 <tags>
-  <tag content="stage">internship</tag>
+  <tag content="Stage">internship</tag>
   <tag>front-page</tag>
 </tags>
 <author id="oberg" />

news/2017/news-20170811-01.ru.xhtml

@@ -133,7 +133,7 @@ contact@fsfe.org. Пожалуйста, не забудьте явно указ
 
 </body>
 <tags>
-  <tag content="internship">практика</tag>
+  <tag content="практика">internship</tag>
   <tag>front-page</tag>
 </tags>
 <author id="oberg" />

news/2017/news-20170811-01.sq.xhtml

@@ -131,7 +131,7 @@ contact@fsfe.org address. We look forward to reading your application!
 
 </body>
 <tags>
-  <tag content="internship">internship</tag>
+  <tag content="Internship">internship</tag>
   <tag>front-page</tag>
 </tags>
 <author id="oberg" />