What languages does the character encoding UTF-8 support

Dunno. Which is better: a saw or a hammer? :-)

Unicode isn't UTF

There's a bit in the article that's a bit more relevant to the subject at hand though:

• UTF-8 focuses on minimizing the byte size for representation of characters from the ASCII set (variable length representation: each character is represented on 1 to 4 bytes, and ASCII characters all fit on 1 byte). As Joel puts it:

“Look at all those zeros!” they said, since they were Americans and they were looking at English text which rarely used code points above U+00FF. Also they were liberal hippies in California who wanted to conserve (sneer). If they were Texans they wouldn’t have minded guzzling twice the number of bytes. But those Californian wimps couldn’t bear the idea of doubling the amount of storage it took for strings

• UTF-32 focuses on exhaustiveness and fixed-length representation, using 4 bytes for all characters. It’s the most straightforward translation, mapping directly the Unicode code-point to 4 bytes. Obviously, it’s not very size-efficient.

• UTF-16 is a compromise, using 2 bytes most of the time, but expanding to 2 * 2 bytes per character to represent certain characters, those not included in the Basic Multilingual Plane (BMP).

Also see The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)

The Ultraedit website says -

If you'd like to globally configure UltraEdit to save all UTF-8 files with BOMs, you can set this by going to Advanced -> Configuration -> File Handling -> Save. The first two options here, "Write UTF-8 BOM header to all UTF-8 files when saved" and "Write UTF-8 BOM on new files created within this program (if above is not set)" should be checked. Conversely, if you do NOT want the BOMs, make sure these are NOT checked.

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