[FIX] *: incorrect translations markings

Fixes a large number of cases where strings are translated then
formatted, instead of letting `_()` do the formatting internally,
which allows it to recover from incorrect translations (missing,
broken, or extra placeholders).

Also

- removes translation markers entirely when there's nothing to
  translate e.g. `_("%s - %s")` is not useful
- fixes a few messes which lead to only partial translatability
  (DRY is generally a bad idea when translations are involved, even
  more so when you don't make the variable part translatable)
- fixes a few nearby issues noticed at the same time
- replaces a few `"%s"` by `%r`, which should automatically quote
  strings relatively appropriately
- fixes translated strings which use `\` to escape a newline (in order
  to fill-paragraph): `\` escapes only the newline, if the
  continuation string is indented this results in a bunch of spaces
  ending in the string to translate, which is pretty garbage for the
  translator, using implicit concatenation works much better

Note: some of the updates revert f-string parameters to %, because
babel (2.9) apparently has trouble with f-strings and blows up trying
to extract them.

Not in scope:

Helping translators fix translatable strings e.g. any translation
string with more than one placeholder probably should use keyword
placeholders

- Provides more context / data to the translator to make sense of the
  sentence.
- Allows reordering the translated terms, which can be necessary
  depending on the sentence and language.

closes odoo/odoo#139314

Related: odoo/enterprise#49311
Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

addons/hr/models/hr_employee.py

@@ -245,7 +245,7 @@ class HrEmployeePrivate(models.Model):
         public_fields = self.env['hr.employee.public']._fields
         private_fields = [fname for fname in field_names if fname not in public_fields]
         if private_fields:
-            raise AccessError(_('The fields "%s" you try to read is not available on the public employee profile.') % (','.join(private_fields)))
+            raise AccessError(_('The fields %r you try to read is not available on the public employee profile.', ','.join(private_fields)))
 
     def _copy_cache_from(self, public, field_names):
         # HACK: retrieve publicly available values from hr.employee.public and

addons/hr/models/hr_job.py

@@ -54,7 +54,7 @@ class Job(models.Model):
         self.ensure_one()
         default = dict(default or {})
         if 'name' not in default:
-            default['name'] = _("%s (copy)") % (self.name)
+            default['name'] = _("%s (copy)", self.name)
         return super(Job, self).copy(default=default)
 
     def write(self, vals):