[FIX] base: avoid duplicated translations when possible

When modifying a translatable record, we try to keep close translations
However, we do not need to do it if there is already a translation for
the matched term.

openerp/addons/base/ir/ir_translation.py

@@ -479,13 +479,18 @@ class ir_translation(osv.osv):
                 continue
 
             # remap existing translations on terms when possible
+            trans_src = record_trans.mapped('src')
             for trans in record_trans:
                 if trans.src == trans.value:
                     discarded += trans
                 elif trans.src not in terms:
                     matches = get_close_matches(trans.src, terms, 1, 0.9)
                     if matches:
-                        trans.write({'src': matches[0], 'state': trans.state})
+                        if matches[0] in trans_src:
+                            # there is already a translation for this term; discard this one
+                            discarded += trans
+                        else:
+                            trans.write({'src': matches[0], 'state': trans.state})
                     else:
                         outdated += trans