Language switcher / selector should redirect to the same page in the chosen language when changing language

[teolemon]

What

Language switcher at the top of all pages should redirect to the same page in the chosen language instead of the homepage

Enregistrement.de.l.ecran.2021-09-03.a.15.23.20.mov

Examples

• http://world.openfoodfacts.org/state/to-be-completed would switch to French version http://world-fr.openfoodfacts.org/etat/a-completer
• Product page would switch languages

Part of

• Navigation
• 🎯 What can I work on ? #5529

[teolemon]

Putting a 👍 on behald of Naruyoko

[Naruyoko]

"Country" menu clicks handled here:

openfoodfacts-server/html/js/display.js

Line 124 in b2f9b1d

}).on("select2:select", function(e) {

Language menu in the template:

openfoodfacts-server/templates/web/common/site_layout.tt.html

Line 97 in b2f9b1d

<li class="has-dropdown">

Substitution of selected_lang and langs set here:

openfoodfacts-server/lib/ProductOpener/Display.pm

Line 6852 in b2f9b1d

$selected_lang = "<a href=\"" . format_subdomain($osubdomain) . "/\">$Langs{$olc}</a>\n";

format_subdomain:

openfoodfacts-server/lib/ProductOpener/URL.pm

Line 81 in b2f9b1d

sub format_subdomain ($sd) {

Looks like format_subdomain just gets the domain for the language, so they don't look like they're supposed to be used here. Is there something that could take the language and the way to identify a page and return the URL for that page in the language?

[hangy]

Is there something that could take the language and the way to identify a page and return the URL for that page in the language?

The analyze_request does something similar when a site is called initially. It might be possible to translate ie. the tagtype, and tag name from the current language to the target language doing the same.