[RELEASE] 5.1.0

What's Changed

• [TASK] Replace custom SiteBaseTestTrait implementation by @sbuerk in #459
• [DOCS] Mention package renaming and 5.x upgrade hurdles by @pixelbrackets in #460
• [TASK] Streamline Extension icons and descriptions by @calien666 in #462
• [!!!][TASK] Remove DeepL Translate fallback to HREF and ISO config by @calien666 in #463
• [TASK] Remove superfluous DataHandler hook handler TCEmainHook by @sbuerk in #465
• [TASK] Make Configuration default for ConfigurationInterface by @sbuerk in #466
• [BUGFIX] Mitigate splitted DataHandler hook method of EXT:container by @sbuerk in #467
• [TASK] Replace TYPO3 localization override with EXT:deepl_base by @sbuerk in #468
• [TASK] Make it possible to have deepl-base symlinked in packages/ by @sbuerk in #469
• [TASK] Refactor for deepl_base usage by @calien666 in #472
• [TASK] Switch to indirect web-vision/deeplcom-deepl-php client extension by @sbuerk in #473
• [TASK] Prepare release for 5.1.0 on main by @sbuerk in #474

Full Changelog: 5.0.3...5.1.0