Completed normal task EXT-6646 ([TRUNCATION] Volume bar truncated.)

The reason: overridden width attributes in localized files.

Fix: remove overrides in 'es', 'fr', 'it', 'pt' locales.
 But override tab width for 'it' locale to accommodate "Mute when minimized" checkbox on Sound & Media panel.

NOTE: there is no enough room for "Mute when minimized" checkbox on Sound & Media panel in 'nl' locale.
 It requires too much space, about 117 extra px and issue should be moved into separate ticket.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/171/

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branch : product-engine