Dynamically changing locales causes inconsistent radio button sizes

[jbphet]

Found during code review, see #165.

When the locale is changed dynamically it can cause the radio button sizes to be inconsistent. There are a couple of screenshots below to illustrate. This is a know common code issue, see phetsims/sun#852, but I thought I should log it so that the designer can decide how important it is to get this fixed before publication.

To illustrate, here is an example of the "Available Decays" panel when launched with locale=de (German):

Here's what this panel looks like if launched with locales=* and then the locale is changed to Deutsch (German):

[jbphet]

Here are a couple of other examples that look a bit worse.

Kurdish:

French:

[jbphet]

Assigning to the people that I think did the design to prioritize this. They can pass it on as appropriate.

[zepumph]

@Luisav1 and I would like to pair on this so she can get a glimpse at some of the i18n dynamic locale work.

[Luisav1]

@zepumph and I fixed this in the commit above. Closing.