Sure, here are simple affirmations translated into several widely spoken languages:

English: "I am confident." Spanish: "Soy seguro/a." Mandarin Chinese: "我有信心。(Wǒ yǒu xìnxīn.)" Hindi: "मैं विश्वासी हूँ। (Main vishwasi hoon.)" Arabic: "أنا واثق. (Ana wathiqa.)" Bengali: "আমি বিশ্বাস করি। (Ami bisshash kori.)" Russian: "Я уверен/уверена. (Ya uveren/uverena.)" Portuguese: "Eu sou confiante." French: "Je suis confiant(e)." Urdu: "میں پر اعتماد ہوں۔ (Main pur etemaad hoon.)" These affirmations are kept simple and straightforward for ease of understanding in each language.