[IMP] conf: special case alt lang links for legal terms

Legal terms live under specific URL as their translations are not
managed in the same manner.

Layout is like this:
  /terms/enterprise.html (EN)
  /terms/i18n/enterprise_fr.html (FR)

This commit adapts the generation of alternative languages links for each
"legal terms page", so that it targets the correct i18n link, or goes
back to the canonical EN one, depending on the target language.

closes #7382

closes #7384

closes #7387

Signed-off-by: Olivier Dony (odo) <odo@odoo.com>

Author: odony

conf.py

@@ -478,8 +478,24 @@ def _build_url(_version=None, _lang=None):
         _version = _version or app.config.version
         _lang = _lang or app.config.language or 'en'
         _canonical_page = f'{pagename}.html'
+
+        # legal translations have different URLs schemes as they are not managed on transifex
+        # e.g. FR translation of /terms/enterprise => /fr/terms/enterprise_fr
+        if pagename.startswith('legal/terms/'):
+            if _lang in legal_translations and not pagename.endswith(f"_{_lang}"):
+                # remove language code for current translation, set target one
+                _page = re.sub("_[a-z]{2}$", "", pagename)
+                if 'terms/i18n' not in _page:
+                    _page = _page.replace("/terms/", "/terms/i18n/")
+                _canonical_page = f'{_page}_{_lang}.html'
+            elif _lang == 'en' and pagename.endswith(tuple(f"_{l}" for l in legal_translations)):
+                # remove language code for current translation, link to original EN one
+                _page = re.sub("_[a-z]{2}$", "", pagename)
+                _canonical_page = f'{_page.replace("/i18n/", "/")}.html'
+
         if app.config.is_remote_build:
             _canonical_page = _canonical_page.replace('index.html', '')
+
         return f'{_root}' \
                f'{f"/{_version}" if app.config.versions else ""}' \
                f'{f"/{_lang}" if _lang != "en" else ""}' \

extensions/odoo_theme/layout_templates/legal.html

@@ -40,7 +40,7 @@ <h5 class="card-title mb-0 d-flex flex-wrap gap-2">{{ _("Odoo Enterprise Agreeme
                                 <a class="btn btn-primary" href="{{ enterprise_agreement_path_en }}" role="button">{{ _("Read") }}</a>
                             {%- else %}
                                 <a class="btn btn-primary" href="{{ 'legal/terms/i18n/enterprise_%s.html' % language_code }}" role="button">{{ _("Read") }}</a>
-                                <a class="btn btn-light text-primary" href="{{ enterprise_agreement_path_en }}">{{ _("English") }}</a>
+                                <a class="btn btn-light text-primary" href="../{{ enterprise_agreement_path_en }}">{{ _("English") }}</a>
                             {%- endif %}
                         </div>
                     </div>