*: use "Recover your Account" as term for password reset action

with erp5_credential it's a bit more than password reset, because
there's also a feature to recover the username for a given email, but
all this can be named "Recover your Account". That was the term already
used in ERP5JS

bt5/erp5_credential/SkinTemplateItem/portal_skins/erp5_credential/ERP5Site_viewCredentialRecoveryLoginDialog.xml

@@ -136,7 +136,7 @@
         </item>
         <item>
             <key> <string>title</string> </key>
-            <value> <string>Send</string> </value>
+            <value> <string>Recover your Account</string> </value>
         </item>
         <item>
             <key> <string>unicode_mode</string> </key>

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/PasswordTool_viewEmailPassword.xml

@@ -132,7 +132,7 @@
         </item>
         <item>
             <key> <string>title</string> </key>
-            <value> <string>Validate</string> </value>
+            <value> <string>Recover your Account</string> </value>
         </item>
         <item>
             <key> <string>unicode_mode</string> </key>