fixed spelling correction popup when there is no extra dictionary

src/gui/value/text.cpp

@@ -519,10 +519,11 @@ String spellcheck_word_at(const String& str, size_t start) {
 void spellcheck_language_at(const String& str, size_t error_pos, SpellChecker** out) {
 	String tag  = tag_at(str,error_pos);
 	size_t pos  = min(tag.find_first_of(_(':')), tag.size()-1);
-	size_t pos2 = min(tag.find_first_of(_(':'),pos+1), tag.size()-1);
+	size_t pos2 = min(tag.find_first_of(_(':'),pos+1), tag.size());
 	String language = tag.substr(pos+1,pos2-pos-1);
 	if (language.empty()) return;
 	out[0] = &SpellChecker::get(language);
+	if (pos2 >= tag.size()) return;
 	String extra = tag.substr(pos2+1);
 	if (extra.empty()) return;
 	out[1] = &SpellChecker::get(extra,language);