Fixed tutorial links, especially to external pages
diff --git a/templates/doc/korap/kalamar.html.ep b/templates/doc/korap/kalamar.html.ep
index 8422747..8e73b0f 100644
--- a/templates/doc/korap/kalamar.html.ep
+++ b/templates/doc/korap/kalamar.html.ep
@@ -6,4 +6,4 @@
<p><strong>Main developer:</strong> Nils Diewald</p>
-<p>Kalamar is the main user frontend of KorAP. It is based on <a href="http://mojolicio.us/">Mojolicious</a> and written in Perl and JavaScript.</p>
+<p>Kalamar is the main user frontend of KorAP. It is based on <%= doc_ext_link_to 'Mojolicious', "http://mojolicio.us/" %> and written in Perl and JavaScript.</p>
diff --git a/templates/doc/korap/koral.html.ep b/templates/doc/korap/koral.html.ep
index 273df7d..d97e458 100644
--- a/templates/doc/korap/koral.html.ep
+++ b/templates/doc/korap/koral.html.ep
@@ -8,4 +8,4 @@
<p>Koral is a library designed for the translation of different corpus query languages to <%= doc_link_to('KoralQuery', 'api', 'koralquery') %>. Currently supported query languages include <%= doc_link_to 'Cosmas II', 'ql', 'cosmas2' %>, <%= doc_link_to('Annis QL', 'ql', 'annis') %>, <%= doc_link_to('Poliqarp+', 'ql', 'poliqarp-plus') %> (an extended version of Poliqarp) and <%= doc_link_to('CQL', 'ql', 'cql') %>.</p>
-<p>Koral is open source and available on <a href="https://github.com/KorAP/Koral">GitHub</a>.</p>
+<p>Koral is open source and available on <%= doc_ext_link_to 'GitHub', "https://github.com/KorAP/Koral" %>.</p>
diff --git a/templates/doc/korap/krill.html.ep b/templates/doc/korap/krill.html.ep
index cb013c0..9e10159 100644
--- a/templates/doc/korap/krill.html.ep
+++ b/templates/doc/korap/krill.html.ep
@@ -6,6 +6,6 @@
<p><strong>Main developer:</strong> Nils Diewald, Eliza Margaretha</p>
-<p>Krill is a <a href="https://lucene.apache.org/">Lucene</a> based search engine for large annotated corpora, used as a backend component for KorAP. It is the reference implementation for <%= doc_link_to('KoralQuery', 'api', 'koralquery') %>, covering most of the protocols features.</p>
+<p>Krill is a <%= doc_ext_link_to 'Lucene', "https://lucene.apache.org/" %> based search engine for large annotated corpora, used as a backend component for KorAP. It is the reference implementation for <%= doc_link_to('KoralQuery', 'api', 'koralquery') %>, covering most of the protocols features.</p>
-<p>Krill is open source and available on <a href="https://github.com/KorAP/Krill">GitHub</a>.</p>
+<p>Krill is open source and available on <%= doc_ext_link_to 'GitHub', "https://github.com/KorAP/Krill" %>.</p>