Currently the content area is an editable iframe and the content is represented as a string value, so it could be searched within this string value and parts of it to be replaced via custom logic. Additionally there is no known approach to get the client's culture.
Nevertheless, I could suggest the following:
- If you need only the German quotation you could implement a custom content filter that replaces the original quotation marks with the desired HTML entities („ = „ “ = “) in the editor's content. The additional problem with this approach would be the detection of the client's language and the implementation logic for detecting the opening and closing quotation mark.
- Another approach that I would recommend to you is using custom tools with keyboard shortcuts, so that the users could choose to insert the quotations or not. For this approach it would be best to use two buttons, one for inserting the opening quotation and the other for the closing. This way the users will be able to use different keyboard shortcuts for fast and easy typing. For more information about custom tools and toolbars you could follow this help article.
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