During fard salah we can only pray in arabic

Can we pray in any language instead of Arabic during fard salah,witr?

Prayer | March 25, 2014 6:34 pm
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Can we perform tahiyyatul wudhoo/masjid (or make up our witr if we couldn’t squeeze it in before Fajr beginning time?) between the adhaan and iqaamah of Fajr salaah?
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Should we stand up for the missed rakah’s before the Imam says as salamu alaykum wa rahmatullah or after he finishes the prayer completely