chore: travel dates are no longer translatable

Dates are written by the import only and are never translated (all rows
are in the default language). Like the matchcodes, the table loses
languageField, transOrigPointerField, transOrigDiffSourceField, its
language columns and the Language tab in TCA; the database columns stay
until the schema clean-up.

Checked locally: frontend crawl (~1,900 URLs incl. the English pages) and
the backchannel APIs render the same as before, the editor check creates
records in all other tables.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/ep_products/Configuration/TCA/tx_epproducts_domain_model_date.php

@@ -14,9 +14,6 @@ return [
         'dividers2tabs' => true,
         'versioningWS' => false,
         'hideTable' => true,
-        'languageField' => 'sys_language_uid',
-        'transOrigPointerField' => 'l10n_parent',
-        'transOrigDiffSourceField' => 'l10n_diffsource',
         'delete' => 'deleted',
         'enablecolumns' => [
             'disabled' => 'hidden',
@@ -30,39 +27,13 @@ return [
         '1' => ['showitem' => 'hidden, bus_pro_id, hotel_bus_pro_id, code, daytrip, date_start, date_end, nights, board,
             board_code, board_bus_pro_id, bus_included, bus_available, skipass_included, group_travel,
             services_included, services_general, courses_included, guide, pickups, discount, min_price, pseudo_price, available, min_pax,
-            new,
-            --div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:language, sys_language_uid, l10n_parent'
+            new'
         ],
     ],
     'palettes' => [
         '1' => ['showitem' => ''],
     ],
     'columns' => [
-        'sys_language_uid' => [
-            'exclude' => false,
-            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_general.xlf:LGL.language',
-            'config' => ['type' => 'language', 'default' => 0],
-        ],
-        'l10n_parent' => [
-            'displayCond' => 'FIELD:sys_language_uid:>:0',
-            'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_general.xlf:LGL.l18n_parent',
-            'config' => [
-                'type' => 'select',
-                'default' => 0,
-                'renderType' => 'selectSingle',
-                'items' => [
-                    ['label' => '', 'value' => 0],
-                ],
-                'foreign_table' => 'tx_epproducts_domain_model_date',
-                'foreign_table_where' => 'AND tx_epproducts_domain_model_date.pid=###CURRENT_PID### AND tx_epproducts_domain_model_date.sys_language_uid IN (-1,0)',
-            ],
-        ],
-        'l10n_diffsource' => [
-            'config' => [
-                'type' => 'passthrough',
-            ],
-        ],
-
         't3ver_label' => [
             'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_general.xlf:LGL.versionLabel',
             'config' => [