The "+ Add a title description" text is not RTL aware. The alignment is incorrect.
I don't have an actual page handy where this happens but this can be observed on a local PCS instance with some minor, temporary modifications.

Steps to reproduce:

• Modify local PCS instance so that it always thinks there is no description:
  • In lib/transformations/pcs/addPageHeader.js add the following block before the EditTransform.newPageHeader() call:

meta.mw.description = '';
meta.mw.description_source = 'central';

• Start service
• Load a page on an RTL wiki, example: http://localhost:8888/he.wikipedia.org/v1/page/mobile-html/A
• Observe the alignment of the "+" icon and the space between it and the text for "add description".

Actual

The "+" icon is not aligned to the right and too close to the text for "add description".

Expected

The "+" icon is aligned to the right and there is some space between it and the text for "add description".