When a users language is set to Japanese, it's not possible to click on the input box to enter a license key for plugins.
It seems to show that the cursor is over the link to upload a plugin, which when clicked results in this popup when plugin uploads are not enabled:
When plugin uploads are enabled, it shows the plugin upload overlay:
Clicking anywhere in the highlighted area brings the overlay to upload a plugin:
I've tested this on a few other languages (Arabic, Korean, Simplified/Traditional Chinese) and couldn't reproduce it there, so its possibly just the Japanese translation where this is happening.
Guess there might be a link tag not being closed correctly. Will check that quickly
This is an issue with the translation. The english source string might be a bit hard to understand, as there are some words placed within and a link. The order of placeholders for Japanese isn't correct, causing the open link tag being placed in the end.
I'll create a PR to split the source string, so no additional words are placed. Hopefully that makes it easier to translate the string.