Fix some UTF-8 issues

src/cgi-bin/translate

@@ -17,6 +17,9 @@ require 'cgi'
 
 LANGUAGE_PAIRS = %w[en-es es-en]
 
+Encoding.default_internal = Encoding::UTF_8
+Encoding.default_external = Encoding::UTF_8
+
 class Object
   def blank?
     nil? || self&.empty?
@@ -74,9 +77,11 @@ ask!('Enter text to translate') if TRANSLATE.blank?
 
 require 'open3'
 
-translation, status = Open3.capture2("apertium", LANG_PAIR, stdin_data: TRANSLATE)
+translation, status = Open3.capture2({'LC_ALL' => 'C.UTF-8'}, 'apertium', '-un', LANG_PAIR, stdin_data: TRANSLATE, binmode: true)
+translation = translation.force_encoding("UTF-8")
+
 
 temp_fail!("Couldn't get translation") unless status.success?
 
-ok!('text/plain; charset="utf-8"', translation)
+ok!('text/plain; charset="utf-8"', ["Source text: #{TRANSLATE}", "Translation: #{translation}"].join("\r\n"))