Yes on purpose as not all languages had decent translations.
Translations will now work and caused by some remarks of @beteljuice I added more information. F.I. peak dates now show the period, not the first day.
Also the new pop-up look as with the UV pop-up, so without the “very contrasting” white borders
As far as I can see the script it is ready for use. 
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For those helping me with testing the script, at line 1512 one can set the current date to any value for this year.
Also test with either the debug console (w34_module_test) or with _test.php
https://pwsdashboard.com/pwsWD/_test.php?test=meteors_popup.php&lang=nl
Both will show the PHP errors and list the missing translations.
UPDATE: New zip, I removed typing error , missing translation in large texts should work
Wim
P.S., Back to the WU convert script, which needs some documentation #-o
meteors_popup.php.zip (5.14 KB)