Unicode characters that make life of translators harder

• Usability
• Less than 30-minutes fix
• Easy for Newbie Dev

It took me some time to find out why I could not translate a particular string in /lib/prefs/freetags.php, and this is it:

'freetags_normalized_valid_chars' => [
			'name' => tra('Valid characters pattern'),
			'description' => tra('Click on the links below to set or clear a pattern to limit characters accepted in tags. '),
			'type' => 'text',
			'size' => '30',
			'hint' => 'Useful to eliminate characters such as “,” which users can enter by mistake instead of a space.',
			'default' => '',
			],

This looks decent, it also carries calls to the tra() subroutine. But I could not catch it with this entry in custom.php:

"Useful to eliminate characters such as “,” which users can enter by mistake instead of a space." => "Nützlich, um Zeichen zu eliminieren wie Kommata, die Benutzer anstelle von Leeerzeichen eingeben können",

The string for pattern matching is exactly identical to it's declaration in the source code, but it was not caught. Until finally I pumped the string into GHex, to look at its real composition.

echo -n "Useful to eliminate characters such as “,” which users can enter by mistake instead of a space." | od -A n -t x1
 55 73 65 66 75 6c 20 74 6f 20 65 6c 69 6d 69 6e
 61 74 65 20 63 68 61 72 61 63 74 65 72 73 20 73
 75 63 68 20 61 73 20 e2 80 9c 2c e2 80 9d 20 77
 68 69 63 68 20 75 73 65 72 73 20 63 61 6e 20 65
 6e 74 65 72 20 62 79 20 6d 69 73 74 61 6b 65 20
 69 6e 73 74 65 61 64 20 6f 66 20 61 20 73 70 61
 63 65 2e

So what's looking decent are actually Unicode characters

e2 80 9c 2c e2 80 9d

I have absolutely no idea how to escape that so PHP will find it in pattern matching... Devs, please do not use Unicode unless really really necessary...

This bug has been demonstrated on show2.tiki.org

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