I've actually started to translate the diplotext into Spanish. I've started with Abu Bakr and Adenauer (alphabetically, of course).
<TEXT>
<Tag>AI_DIPLO_FIRST_CONTACT_LEADER_ABU_BAKR_1</Tag>1
<English>Peace be unto you, [CT_NAME]. I am the righteous [OUR_NAME] of the [OUR_EMPIRE]. May there be peace betwen us for as long as we worship the same deity!</English>
<Spanish>La paz esté con vos, [CT_NAME]. Soy el honrado [CT_NAME] del [OUR_EMPIRE]. ¡Que haya paz entre nuestras naciones siempre que adoremos la misma deidad!</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_REFUSE_TO_TALK_LEADER_ABU_BAKR_1</Tag>
<English>Silence! I kill you!</English>
<Spanish>¡Silencio! ¡Os mato!</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_NO_PEACE_LEADER_ABU_BAKR_1</Tag>
<English>There will be no peace until you convert from your wicked ways.</English>
<Spanish>No habrá paz hasta que abandoneís vuestras malas mañas.</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_GREETINGS_ATT_FR_LEADER_ABU_BAKR_1 </Tag>
<English>You are my favorite infidel in the whole wide world, [CT_NAME]!</English>
<Spanish>¡Sois mi infiel favorito en todo el mundo, [CT_NAME]!</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_GREETINGS_ATT_FUR_LEADER_ABU_BAKR_ 1</Tag>
<English>What is it now, you swine-eating drunkard?</English>
<Spanish>¿De qué se trata ahora, borracho comepuerco?</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_DEMAND_TRIBUTE_POWER_WEAKER_ABU_BAKR_1</Tag>
<English>Allah is watching you, [CT_NAME]. He would really like if you did this good deed, you know.</English>
<Spanish>Alá os mira, [CT_NAME]. Le gustaría mucho veros hacer este buen negocio, sabeís.</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_DEMAND_TRIBUTE_POWER_EQUAL_ABU_BAKR_ 1</Tag>
<English>If you give this to me, [CT_NAME], there might be 72 virgins waiting to greet you in the afterlife!</English>
<Spanish>Si nos dais esto, [CT_NAME], puede ser que haya 72 vírgenes que os esperen en la otra vida.</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_DEMAND_TRIBUTE_POWER_STRONGER_ABU_BAKR_1</Tag>
<English>Mighty [OUR_CIV_SHORT] will crush your kingdom of evil if you don't obey her commands!</English>
<Spanish>¡La poderosa nación de [OUR_CIV_SHORT] aplastará vuestro reino del mar si no obedeceís sus órdenes!</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_FIRST_CONTACT_LEADER_ADENAUER_1</Tag>1
<English>Good day to you, My name is [OUR_NAME]. Our [OUR_EMPIRE] has done very nasty things in the past, but I'm happy to announce that we've turned over a new leaf. Would you like to be friends with the new, nicer [OUR_CIV_ADJ] people?</English>
<Spanish>Buen día, [CT_NAME]. Mi nombre es [OUR_NAME]. El [OUR_EMPIRE] ha hecho cosas muy malas en el pasado, pero me alegra anunciar que hemos pasado página. ¿Os gustaría ser el amigo del nuevo y simpático pueblo [OUR_CIV_ADJ:1]?</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_REFUSE_TO_TALK_LEADER_ADENAUER_1</Tag>
<English>I advise you leave me before I start shouting out nasty racial epithets I've worked so hard to repress.</English>
<Spanish>Os aconsejo que me dejeís antes de que comienze a gritar los horribles epítetos raciales que trabajé tan duro para reprimir.</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_NO_PEACE_LEADER_ADENAUER_1</Tag>
<English>Hehehe... I was right after all. You can never be too stupid!</English>
<Spanish>Jejeje... Tenía razon. ¡No hay límites para la estupidez!</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_GREETINGS_ATT_FR_LEADER_ADENAUER_1 </Tag>
<English>I'm so glad I can trust in you, [CT_NAME]. You wouldn't believe how many people hate the [CT_EMPIRE] because of... well, you know.</English>
<Spanish>Me alegra poder confiar en vos, [CT_NAME]. No podeís creer cuánta gente odia al [CT_EMPIRE] por... bueno, ya sabeís.</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_GREETINGS_ATT_FUR_LEADER_ADENAUER_ 1</Tag>
<English>You remind me so much of our old rulers, [CT_NAME]. In fact, you might be even meaner and more atrocious than them.</English>
<Spanish>Me recordaís tanto a nuestros viejos gobernantes, [CT_NAME]. De hecho, probablemente sois más mezquino y atroz que ellos.</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_DEMAND_TRIBUTE_POWER_WEAKER_ADENAUER_1</Tag>
<English>[OUR_CIV_SHORT] is still recovering from horrible events that we'd rather not mention ever again. Care to make a small donation?</English>
<Spanish>[OUR_CIV_SHORT] todavía está recuperándose de eventos que preferimos no mencionar nunca jamás. ¿Os importaría dar una pequeña donación?</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_DEMAND_TRIBUTE_POWER_EQUAL_ADENAUER_ 1</Tag>
<English>It's horribly politically incorrect of me to say this, but we want your stuff. And we're willing to do anything for it.</English>
<Spanish>Es horriblemente políticamente correcto decirlo, pero queremos vuestras cosas. Y estamos dispuestos a hacer cualquier cosa para tenerlas.</Spanish>
</TEXT>
<TEXT>
<Tag>AI_DIPLO_DEMAND_TRIBUTE_POWER_STRONGER_ADENAUER_1</Tag>
<English>If you don't give me what I want, I just might go insane, grow a mustache, and start killing everything in sight! You don't to start another world war, do you?</English>
<Spanish>Si no nos daís lo que quiero, puede ser que me vuelva loco, me deje crecer el bigote y comienze a matar todo alrededor. No quereís empezar otra guerra mundial, ¿verdad?</Spanish>
</TEXT>