To reproduce:

• Use Commons with English as the user interface language.
• Upload a file.
• During the uploading add this caption, and make sure to select Hebrew as the caption's language: אחת two שלוש
• When you get to the "Add data" step, the caption in Hebrew is shown.
  • Observed: The HTML element that contains the caption doesn't have the correct lang and dir attributes. The text is shown with the word אחת on the left-hand end and the word שלוש on the right-hand end.
  • Expected: The text must be shown with the word אחת on the right-hand end and the word שלוש on the left-hand end. The HTML element that contains the caption must have lang="he" and dir="rtl", because it's explicitly known that it's Hebrew and right-to-left.

Here's a screenshot of a recent upload:

The filename is https://commons.wikimedia.org/wiki/File:P300_vs_local_oddball_probability.svg . The caption in Hebrew is shown incorrectly.