Better i18n (cont.)

1. Fix sentence breaks inside `photo_reverification.html` and `midcourse_photo_reverification.html`.
2. Combine three setences inside `choose.html`.
3. Adding some punctuation marks to reduce duplicated strings with only different Punctuation marks in translation.
4. Move the colons inside the strings to be translated. This may be not necessary for now, but I think this may help translation by removing potential word meaning conflict.
5. Sorry for