For translations have a look at Localise which i ve used and i know it works fine on 1.7
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http://extensions.joomla.org/extensions/languages/language-edition/17755
For characters depends where you are talking about , if its titles etc, font you are using has to be compatible with those characters , basically it must contain support for them...
If its not font related e.g components or text thats stored in database in plain text but does not work with your character set then language encoding could be set wrong for those components or modules whichever...
Check this knowledge base from Gavickpro which is about their products but might be helpfull for your problem. Just make sure you backup your website...
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https://www.gavick.com/supportdesk/index.php?/Knowledgebase/Article/View/2/0/how-can-i-show-my-native-characters-language-on-titles-of-the-photoslide--news-image-module