Where can i translate wordpress sentences/word?

in my french ver开发者_运维技巧sion of wordpress, i have some untranslated string such as

• "Posted By"
• "Comments"
• "leave a reply" ... "name"

Where can i translate such strings please ?

Thanks

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Should be in your active theme files, such as comments.php, index.php, page.php, etc. See if there is a .po file: Translating WordPress « WordPress Codex