Is it permissible to listen to anasheed (Islamic songs) that include a dialogue between someone optimistic about despair and another optimistic about the future of Palestine, with an issue regarding the use of the word "only" in an anasheed describing the mother, and does this conflict with seeking Allah's pleasure?

There is no harm in listening to such anashid (religious songs/chants) if they are free of Sharia prohibitions like music, and if their content is beneficial and their meaning good, provided one does not overdo it. The word "only" may be used to express the importance and priority of what is mentioned over other things, not to negate desire for anything else.