WIP: fix potential wrong language on first use

Currently, when first used, the baseLocale is always used. This results in the initial rendering being done with the baseLocale, but then immediately followed by a re-rendering with the current locale. This is unpleasant but not critical on the client side. However, when using SSR (Server-Side Rendering), this leads to the page being generated with the baseLocale regardless of the chosen language. UPD: It seems that fixing this I broke something else. I'll take a little more time. UPD2: I will also add a test for my problem. UPD3: this is my local problem, due to the fact that I do not use the [problematic implementation of nanostores/react](https://github.com/nanostores/react/issues/17). If that problem is solved in the proposed way, then this PR will be useful, for now it should be left as WIP.