Wrap hardcoded aria-label strings with __() for i18n support

[joshhanley]

The Scenario

Components with interactive elements like the modal close button and clearable input have hardcoded English aria-label attributes. Screen reader users in non-English locales hear English labels regardless of their application's language, making these components inaccessible to international users.

{{-- modal/index.blade.php --}}
<flux:button aria-label="Close modal">...</flux:button>

{{-- input/clearable.blade.php --}}
<flux:button aria-label="Clear input">...</flux:button>

The Problem

Several components use raw English strings in aria-label attributes instead of wrapping them with Laravel's __() translation helper. Other components in Flux already follow the correct pattern (e.g., sidebar/toggle.blade.php uses aria-label="{{ __('Toggle sidebar') }}"), so this is an inconsistency rather than a deliberate design decision.

The Solution

Wrap all hardcoded aria-label strings with __() so they can be translated via Laravel's JSON translation files:

{{-- Before --}}
aria-label="Close modal"

{{-- After --}}
aria-label="{{ __('Close modal') }}"

Strings added to the translatable set:

• "Clear input"
• "Close modal"

A corresponding PR for Flux Pro covers the remaining hardcoded strings there.

Fixes #2294