docs: remove `task generate-bindata` step from sync from Crowdin (#6887)

[skip ci]

docs/dev/import_locale.md

@@ -9,7 +9,6 @@
     Locale files has been successfully imported!
     ```
 
-1. Run `task generate-bindata` to generate corresponding bindata.
 1. Run `task web` to start the web server, then visit the site in the browser to make sure nothing blows up.
 1. Check out a new branch using `git checkout -b update-locales`.
 1. Stage changes