[FIX] base: update en_US translation on src update

On the website when you modified a string with not much change, we
modify the translation source so they are not dropped.

But we also do it for an en_US translation, so if we have a translation:

lang=en_US/src=helloworld/value=helloworld

if we change `helloworld` by `helloworld!` the translation would become:

lang=en_US/src=helloworld!/value=helloworld

which would make it seem like the change did not work at all.

Without change, modifed test fail on second:

    self.assertEqual(view.with_env(env_us).arch_db, archf % terms_en)

with assertion:

    AssertionError: '<form string="X">Bread and cheeze</form>'
                 != '<form string="X">Bread and cheese</form>'

opw-2153422
closes #41714

closes odoo/odoo#41809

X-original-commit: 7eb603b26cc591b85ceb11210f5db8308d2ba27a
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

odoo/addons/base/models/ir_translation.py

@@ -437,7 +437,10 @@ class IrTranslation(models.Model):
                 elif (src, translation.lang) in done:
                     discarded += translation
                 else:
-                    translation.write({'src': src, 'state': translation.state})
+                    vals = {'src': src, 'state': translation.state}
+                    if translation.lang == 'en_US':
+                        vals['value'] = src
+                    translation.write(vals)
                     done.add((src, translation.lang))
 
         # process outdated and discarded translations

odoo/addons/base/tests/test_translate.py

@@ -652,19 +652,23 @@ class TestXMLTranslation(TransactionCase):
         view = self.create_view(archf, terms_en, fr_FR=terms_fr, nl_NL=terms_nl)
 
         env_en = self.env(context={})
+        env_us = self.env(context={'lang': 'en_US'})
         env_fr = self.env(context={'lang': 'fr_FR'})
         env_nl = self.env(context={'lang': 'nl_NL'})
 
         self.assertEqual(view.with_env(env_en).arch_db, archf % terms_en)
+        self.assertEqual(view.with_env(env_us).arch_db, archf % terms_en)
         self.assertEqual(view.with_env(env_fr).arch_db, archf % terms_fr)
         self.assertEqual(view.with_env(env_nl).arch_db, archf % terms_nl)
 
         # modify source term in view (fixed type in 'cheeze')
         terms_en = ('Bread and cheese',)
         view.write({'arch_db': archf % terms_en})
+        view.invalidate_cache(fnames=['arch_db'], ids=view.ids)
 
         # check whether translations have been synchronized
         self.assertEqual(view.with_env(env_en).arch_db, archf % terms_en)
+        self.assertEqual(view.with_env(env_us).arch_db, archf % terms_en)
         self.assertEqual(view.with_env(env_fr).arch_db, archf % terms_fr)
         self.assertEqual(view.with_env(env_nl).arch_db, archf % terms_nl)