Issue 1658 - Preserve original "style" atribute for generated filters

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extra : amend_source : 2593b32cd3dc9382c21971f3d8cff74529a5dae4
Issue 1666 - Use es-419 on Safari if UI language is Spanish outside of Spain

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extra : amend_source : 16a937d5ec13467f8c35452a0f4b6e43c06513af
Issue 1611 - Fixed inconsistent behavior with "Block element" context menu item

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extra : rebase_source : c9a97a288a97c73f36e25866304604f341fa94d2
Issue 1674 - Use String.trim() to strip leading and trailing whitespaces

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extra : rebase_source : 9bed0b3fd3d180651c7edb90883f00c31fb174d6