Save this page from your browser's "view source" utility. Do not pass it through any other editor. Upload it to your own server and you should see appropriate characters in this list:
| English | English |
| Chinese | 中文 |
| French | Français |
| Greek | Ελληνικά |
| Hebrew | עברית |
| Japanese | 日本語 |
| Russian | Русский |
If those look OK then your server is running happily with utf-8. If not, you will need to look at your web server configuration. Apache 2 should be OK by default but make sure the <head> section of every page includes <meta http-equiv="content-type" content="text/html; charset=utf-8" /> and not another charset.
WARNING: Although MS Notepad should cause you no problems, some text editors and supposedly up-to-date HTML authoring packages may not save utf-8 correctly. Even if your usual text editor is problematical, when using yeti you don't need utf-8 support to edit the standard (pre-translation) versions of your web pages in "Latin character" languages like English etc..