Feature: #93794 - Override TCA description with TSconfig

See forge#93794

Description

The TCA description, introduced in forge#85410, allows to define a description for a TCA field, next to its label. Since the purpose of a field may change depending on the current page, it is now possible to override the TCA description property with page TSconfig.

TCEFORM.aTable.aField.description = override description
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As already known from other properties, this can also be configured for a specific language.

TCEFORM.aTable.aField.description.de = override description for DE
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The option can be used on a per record type basis, too.

TCEFORM.aTable.aField.types.aType.description = override description for aType
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Also referencing language labels is supported.

TCEFORM.aTable.aField.description = LLL:EXT:my_ext/Resources/Private/Language/locallang.xlf:override_description
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