i18n(Topics): Localized route generation

Related to #3728 (comment 1945863634)

Step 1: What is changing in this MR?

• Update the way the routes are generated for the Topics pages adding the corresponding localized routes to the build

Production	Review app
https://about.gitlab.com/	https://topics-devops-localization.about.gitlab-review.app/topics/devops/
N/A	https://topics-devops-localization.about.gitlab-review.app/ja-jp/topics/devops/
N/A	https://topics-devops-localization.about.gitlab-review.app/de-de/topics/devops/
N/A	https://topics-devops-localization.about.gitlab-review.app/fr-fr/topics/devops/

Step 2: Deployment checklist

• Merge this MR
• Publish Contentful Localized Topics-Devops release

Build Variables:

• Use Contentful Preview API