nombraríamos
-we would mention
The word nombraríamos is the conditional form of nombrar in the first person plural.
See the full nombrar conjugation

nombrar

A este archivo index es recomendable cambiarle el nombre y darle el mismo que tiene la actividad, en este caso lo nombraríamos activity1.htm.
It is recommendable to change its name and give it the same one that the activity has, in this case we would call it activity1.htm.
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