Preserve current filter state in URL #34

[jalezi]

UPDATE #34

This PR has two parts.

First part commits from 722b6ff to 15064e1:
Refactor localization. Package i18next is used only for initialization. We are using hook from react-i18next package.
Also I removed default language while we are using LanguageDetector.

Second part commits from d13917a to eaecec6:
Preserve current filter state in URL.
All routes for languages and doctor type are not dynamic.

before:

    <Route
      path="/:lang/:type/:name/:instId"
      ...
    />

after:

      <Route
        key={`${lang}-dr-page`}
        path={`/${lang}/${type}/:name/:instId`}
        ...
      />

If this PR is not merged, commit 7c22789 can be still merged. Code is dead.

[jalezi]

I have just find a small bug.

[stefanb]

It should not push a new entry into the browser history - pressing back button now only changes search parameters in the url, and possibly moving the map view. It should go to the previous page.

Maybe something like:

Suggested change

	navigate(`./#${hash}`);
	navigate(`./#${hash}`, { replace: true });

? Didn't test that.

[stefanb]

Is navigate() used also somewhere else? Search box changes are put into browser history, pressing back is just stepping back the search box queries.

[jalezi]

Is navigate() used also somewhere else? Search box changes are put into browser history, pressing back is just stepping back the search box queries.

yes in Doctors/index.js. I am stuck. Needs different approach. Unfortunately ATM I don't have time.