Add tests for 8-bit clean comparison and binary comparison.

tests/lang-utf8.gperf

@@ -0,0 +1,26 @@
+struct language {
+  const char *foreign_name;
+  const char *english_name;
+  const char *locale;
+};
+%%
+አማርኛ,       "Amharic",    NULL
+česky,      "Czech",      "cs_CZ.UTF-8"
+Dansk,      "Danish",     "da_DK.UTF-8"
+English,    "English",    "en_GB.UTF-8"
+Suomi,      "Finnish",    "fi_FI.UTF-8"
+Français,   "French",     "fr_FR.UTF-8"
+Deutsch,    "German",     "de_DE.UTF-8"
+Ελληνικά,   "Greek",      "el_GR.UTF-8"
+עברית,      "Hebrew",     "he_IL.UTF-8"
+Italiano,   "Italian",    "it_IT.UTF-8"
+Norsk,      "Norwegian",  "no_NO.UTF-8"
+Русский,    "Russian",    "ru_RU.UTF-8"
+Español,    "Spanish",    "es_ES.UTF-8"
+Svenska,    "Swedish",    "sv_SE.UTF-8"
+ภาษาไทย,    "Thai",       "th_TH.UTF-8"
+Türkçe,     "Turkish",    "tr_TR.UTF-8"
+Tiếng Việt, "Vietnamese", "vi_VN.UTF-8"
+日本語,     "Japanese",   "ja_JP.UTF-8"
+中文,       "Chinese",    "zh_CN.UTF-8"
+한글,       "Korean",     "ko_KR.UTF-8"