Preconditions:
Nightly - RTL build(71.0a1)
Set 'devtools.netmonitor.features.webSockets' to "true" in about:config and after that restart the browser.

Steps to reproduce:

1. Launch Firefox browser
2. Navigate to: http://janodvarko.cz/test/websockets/
3. Press F12 to open Devtools
4. Go to the Network tab
5. Press "Connect" button from the page opened in step 2
6. Click on "http://echo.websocket.org" websocket request
7. Click on "Messages" panel
8. Type a message and press "Send" button from the page opened in step 2

Actual result:
"Messages" tab is not translated. Time is not correctly displayed.

Expected result:
"Messages" tab should be translated. Time should be correctly displayed.

Thanks for the report!
Honza

Francesco, does this mean that is hasn't been translated yet?

I think that it's properly implemented code-wise:

1. The panel title is defined here:
   https://searchfox.org/mozilla-central/rev/9df2ccc256fe54c314b34e52920471a0d04b283e/devtools/client/netmonitor/src/components/TabboxPanel.js#37
2. The translation is here:
   https://searchfox.org/mozilla-central/rev/9df2ccc256fe54c314b34e52920471a0d04b283e/devtools/client/locales/en-US/netmonitor.properties#795

Honza

Correct, and I would normally close bugs for incomplete localizations as INVALID, since there's no commitment to ship 100% localization.

If you really want to test RTL, in general Hebrew is a better pick
https://transvision.mozfr.org/string/?entity=devtools/client/netmonitor.properties:netmonitor.tab.messages&repo=gecko_strings

From the screenshot, that looks like Arabic, "RTL Build" is not really a thing.

Thanks for the update Francesco!

Closing as invalid, we'll just need to wait for the localization.

Honza