[BACKPORT] Fix reverse error for renamed session_language URL

[dyudyunov]

This is a backport from #33729

Description

The URL was renamed, but some templates use the old name.

Steps to reproduce

1. Add several language codes to the Dark Lang Config using the LMS admin (e.g. en, uk)
2. Log out

Actual result

NoReverseMatch error

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[mphilbrick211]

Hi @navinkarkera! Would you be able to merge this backport since you merged the master? If not, let me know.

[navinkarkera]

@dyudyunov Thanks! Looks good.

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