Asklemmy

I do not speak an RTL language either, but from what I know of I can give you an idea of what it takes to support it properly.

The start would be to add dir="rtl" to the html element and see what needs fixing: thankfully because you use flexbox in most places the layout naturally switches. The rest would be to use logical properties: text-align:start; instead of text-align:left, padding-inline-start instead of padding-left… Most of the CSS spatial properties have their logical sibling, even border-radius. If needed, you can also overwrite rules with html[dir="rtl"] {…}

Then, for user inputed text, each top level node (p, ul, ol, blockquote, h1…) should have the dir="auto" attribute, so it's possible to have text in two directions, depending on the first word of the element. Simply doing <textarea dir="auto"> isn't possible because then the first word decides of the text direction for the whole content. Supporting RTL fully also means supporting mixed directional text.