Fix PT-PT translation bugs and update breadcrumb styling

[eduardojst10]

• cleaned unused imports from representation browse/toolbar classes
• fix PT-PT translation issues and updated search drop down labels for Preservation Events and Disposal Confirmations
• replaced hardcoded Disposal Confirmation group titles with i18n message key
• simplify breadcrumb CSS allowing for full display of entity name, also removing not used toolbar breadcrumb styling

Fixes #3552, #3553 and #3554

[dosubot]

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