dont use a template function for this

Author: spullara

compiler/src/test/java/com/github/mustachejava/SpecDisc155Test.java

@@ -25,7 +25,7 @@ static class I18N {
             return "";
         };
         String defaultText;
-        TemplateFunction t = content -> {
+        Function<String, String> t = content -> {
             defaultText = content;
             return "";
         };