The colon at the beginning of the line is for indent and is omited, which is correct:
:<translate>A dedicated team will be available on-site to help support a safer environment for all.</translate>
However, an inline colon is part of the sentence and sentences generally shouldn't be split into different units.
Current tool behaviour:
*<translate> What</translate>:<translate> Enter the title of the event</translate> *<translate> Register your interest, using your signature (4 tildes)</translate>:
Desirable behaviour:
*<translate> What: Enter the title of the event</translate> *<translate> Register your interest, using your signature (4 tildes):</translate>