Code Reviews are all opinionated yes, even math is opinionated (occasionally, and for some values of math).
Now, if you are seeking a code review, then your question is not opinionted as per the scope of Code Review.
But, if your question basically starts with:
Imagine you have a class with dozens of the follow lines of code and that you should localize it.
Then it is opinionated, because using imagination to that extent requires more context and opinion than can be scoped back to the code in the question.
In addition, you are providing two different ways to initialize three variable declarations, and that's it.... you do not ask for a review of either version, you sort of suggest that you want affirmation that the second version is better, based on the title of the question: "Localizing a long list of description in a static class"
So, are you asking whether your second version is an improvement over the first, or are you asking us to review the second version (in which case the first version is moot)?
Are you looking for a discussion on what best practices would be in this 'imaginary' use case?
If any of those are the case, then the question is either opinionated, or off topic.
You need to present working, real code, and that can be reviewed.
Discussions about best practices are not on topic, broken code is off topic too, and 'imagine you have' situations are very off topic and opinionated.
Now, whether your question should be closed as off-topic, or opinionated, or too broad, is really not significant because I can think of reasons for each of them, but can choose only one. (Update: too broad is also an option here)
Update On a serious note, the basic premise of Code Review was summarized as: "Does this code make my ass look fat" .... and that requires an opinionated response. So, yes, Code Review is opinionated, but the opinions have to be based on code that is presented in the question, not sucked from imagination or elsewhere.