Detect duplicated source reference comments in PO files

[luisg123v]

We already detect duplicated source terms (msgid), thanks to duplicate-po-message-definition on OCA/pylint-odoo#374 , e.g.:

#. module: mymodule
#: model:ir.model.fields,field_description:mymodule.field_res_partner__salesperson_id
msgid "Internal Salesperson"
msgstr "Vendedor Interno"

#. module: mymodule
#: model:ir.model.fields,field_description:mymodule.field_res_users__salesperson_id
msgid "Internal Salesperson"
msgstr "Vendedor Interno"

However, when msgid's are different but comments are the same, we are not catching such cases:

#. module: mymodule
#: model:ir.model.fields,field_description:mymodule.field_res_partner__salesperson_id
msgid "Internal Salesperson"
msgstr "Vendedor Interno"

#. module: mymodule
#: model:ir.model.fields,field_description:mymodule.field_res_partner__salesperson_id
msgid "Internal Salesperson 2"
msgstr "Vendedor Interno 2"

Even though the latter is syntactically correct regarding PO format, it raises the same error (see OCA/pylint-odoo#289 for the full error message), because it means two terms are trying to translate the same record and field.

Note that this only applies for comments starting with:

# : model:

Other terms like the following ones don't need to be considered, because they don't refer to a specific record:

• #: code:: refers to translatable terms inside code, and code could have the same term several times. Besides, starting from v14, lines are ignored within translations, so all terms are included as if they were on line zero.
• #: model_terms:: usually refers to terms inside views. Same case, the same view could have the same term in several places (e.g. page and group).

[luisg123v]

@moylop260 @edy1192 @deivislaya @antonag32

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