Localize javascript components in `assets/js`

[awvwgk]

The javascript in assets/js contains a few keywords that should be localized as well after #201 is merged.

fortran-lang.org/assets/js/gh-contributors.js

Line 329 in 8ca4ed7

<i><b> {{nContrib}} contributions </b></i>

fortran-lang.org/assets/js/gh-contributors.js

Line 423 in 8ca4ed7

<b>Repository: </b>

fortran-lang.org/assets/js/gh-contributors.js

Line 425 in 8ca4ed7

<option value="all">All</option>

fortran-lang.org/assets/js/gh-contributors.js

Line 431 in 8ca4ed7

<b>User plots: </b>

[awvwgk]

This should be resolved with the new webpage (see #415)