Normalize whitespace

[Jed Burke]

Japanese product name occasionally have a full-width space instead of the half-width one used in English.

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Tokiskai Kurumi
Tokisaki　Kurumi

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As search filters do aren’t spec'd for them, I think it would be best to replace full-width spaces with half-width ones in product names and filters inputted by the user. We’ll be able to resolve hidden bugs and possible avoid future ones by doing so.

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[Jed Burke]

All user input is now normalized. Full-width Latin characters are made half-width along with the whitespace.

[Jed Burke]

Reference closed issue #2

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