fix: automatic routing for translated text routes

[stephanegigandet]

This PR improves the routing of text pages so that translated text routes in .po files (e.g /discover and /conditions-d-utilisation in French) are matched with the corresponding /lang/fr/discover.html text.

Note: openfoodfacts-web currently has links or translated file names ( https://github.com/openfoodfacts/openfoodfacts-web/tree/main/lang/fr/texts/ ). Those should be removed.

This PR replaces #12644

Also renamed Index.pm to Texts.pm (clearer) and added some docs and a couple of tests.

[teolemon]

( STDERR )  job 12    [Fri Nov 21 11:02:18 2025] tags.t: Use of uninitialized value $ProductOpener::Tags::lang_dir in concatenation (.) or string at /opt/product-opener/lib/ProductOpener/Tags.pm line 4522.
(  DIAG  )  job 12    warning: The  could not be opened.
(  DIAG  )  job 12    warning: Tags texts could not be loaded.
[  FAIL  ]  job 12  + e100 text contains "curcumine"
[  DEBUG ]  job 12    tests/unit/tags.t line 668
(  DIAG  )  job 12    +---------+----+-----------------+
(  DIAG  )  job 12    | GOT     | OP | CHECK           |
(  DIAG  )  job 12    +---------+----+-----------------+
(  DIAG  )  job 12    | <UNDEF> | =~ | (?^u:curcumine) |
(  DIAG  )  job 12    +---------+----+-----------------+
(  DIAG  )  job 12    undef
( STDERR )  job 12    [Fri Nov 21 11:02:18 2025] tags.t: Use of uninitialized value $ProductOpener::Tags::lang_dir in string at /opt/product-opener/lib/ProductOpener/Tags.pm line 4961.
( STDERR )  job 12    [Fri Nov 21 11:02:18 2025] tags.t: Use of uninitialized value $ProductOpener::Tags::lang_dir in concatenation (.) or string at /opt/product-opener/lib/ProductOpener/Tags.pm line 4961.
[  FAIL  ]  job 12  + <UNNAMED ASSERTION>
[  DEBUG ]  job 12    tests/unit/tags.t line 890
(  DIAG  )  job 12    Unicode::GCString is not installed, table may not display all unicode characters properly
(  DIAG  )  job 12    +---------+----------------------------------------------------------------+
(  DIAG  )  job 12    | GOT     | CHECK                                                          |
(  DIAG  )  job 12    +---------+----------------------------------------------------------------+
(  DIAG  )  job 12    | <UNDEF> | <p>La curcumine ne présente pas de risques connus pour la sant |
(  DIAG  )  job 12    |         | é.</p>                                                         |
(  DIAG  )  job 12    +---------+----------------------------------------------------------------+
[  FAIL  ]  job 12  + <UNNAMED ASSERTION>
[  DEBUG ]  job 12    tests/unit/tags.t line 895
(  DIAG  )  job 12    Unicode::GCString is not installed, table may not display all unicode characters properly
(  DIAG  )  job 12    +---------+----------------------------------------------------------------+
(  DIAG  )  job 12    | GOT     | CHECK                                                          |
(  DIAG  )  job 12    +---------+----------------------------------------------------------------+
(  DIAG  )  job 12    | <UNDEF> | <p>La curcumine ne présente pas de risques connus pour la sant |
(  DIAG  )  job 12    |         | é.</p>                                                         |
(  DIAG  )  job 12    +---------+----------------------------------------------------------------+
(  DIAG  )  job 12    Seeded srand with seed '20251121' from local date.
(  DIAG  )  job 12    Looks like you failed 3 tests of 210.

[alexgarel]

Cool !

[teolemon]

@alexgarel @stephanegigandet We will need to solve Donations, to ensure we always serve the translated pages: https://github.com/openfoodfacts/openfoodfacts-server/blob/main/conf/nginx/snippets/off.locations-redirects.include

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud