[FIX] http: force mimetype of .js files to text/javascript

Previously, when the odoo server was running on some Windows
installations, it was possible for javascript files loaded directly from
the static folder of an addon to fail to run because the Content-Type
header was set to text/plain instead of text/javascript. This is because
the mimetypes module from the standard library honors the mimetypes from
the OS, in the case of Windows it reads a key in the registry, which can
be misconfigured to text/plain for .js files.

This commit forces the mimetype of .js files to text/javascript to solve
this issue.

closes #162277

X-original-commit: 9474c99
Signed-off-by: Julien Castiaux (juc) <juc@odoo.com>

odoo/http.py

@@ -187,6 +187,9 @@
 mimetypes.add_type('application/x-font-ttf', '.ttf')
 # Add potentially wrong (detected on windows) svg mime types
 mimetypes.add_type('image/svg+xml', '.svg')
+# this one can be present on windows with the value 'text/plain' which
+# breaks loading js files from an addon's static folder
+mimetypes.add_type('text/javascript', '.js')
 
 # To remove when corrected in Babel
 babel.core.LOCALE_ALIASES['nb'] = 'nb_NO'