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OKay, so if we properly use hreflang tags, and link sites each other, based on the hreflang tag protocol, then is this acceptable and safe to use JavaScript to render translations client-side, specifically for the Google search engine?

Hello World!

Background: I am evaluating a tool/service that a company wants to use for managing the translated versions of their international/multi-lingual websites: https://www.transifex.com/product/transifexlive/

Transifex is asking webmaster to "simply add a snippet of JavaScript" to their website(s); the approved translations are added by the business in the back-end; and the translated sites are made live with the click of a button (on/to the proper ccTLD, sub-domain, or sub-directory, which is specified).

CONCERN: Even though I know Google reads JavaScript for crawling and ranking,
I am concerned because I see the "English text" when I view the source-code on the "German site", and I wonder if this is really acceptable?

QUESTION: Is a service like this (such as Transifex using JavaScript to render translations client-side) safe for indexing and ranking for my clients' international search engine visibility, especially via Google?

Thank you!