Address some potential bugs in translations

Over in https://github.com/phetsims/number-play/issues/226, QA reported some spots that seemed pretty obvious to be a mistake. For example, where a parenthesis is opened but not closed, or there is a third template var curly brace. We spoke to @jbphet and he mentioned that just manually fixing these, if we feel very very confident of translator error, is totally fine.

So we did https://github.com/phetsims/babel/commit/98db64e43d8dc8b6c8c02d16c6b4c835b0c156f4

From that there are a couple of questions more generally (note that by searching in _generated_development_strings you don't search through history, and just current values of strings):

• 2 usages {{{
• 2 usage of }}}
• 86 usages of ".*\([^)\n]*" (match an open paren that isn't closed), though we need to be careful about rtl languages here
• 24 usages of "[^(\n]*\).*" (match a closed paren without an open), again worry about rtl languages and manually inspect things

@jbphet, does this seem like a worth while investigation?