linter: Allow using javascript instead of JavaScript for calling examples.
linter: Allow using javascript instead of JavaScript for calling examples.

This allows us to call js code examples as follows:

`{generate_code_example(javascript)|/users:post|example()}`

synicalsyntax/zulip,eeshangarg/zulip,brainwane/zulip,andersk/zulip,timabbott/zulip,shubhamdhama/zulip,rht/zulip,kou/zulip,hackerkid/zulip,hackerkid/zulip,kou/zulip,andersk/zulip,rht/zulip,rht/zulip,hackerkid/zulip,hackerkid/zulip,timabbott/zulip,punchagan/zulip,shubhamdhama/zulip,synicalsyntax/zulip,rht/zulip,brainwane/zulip,rht/zulip,punchagan/zulip,brainwane/zulip,zulip/zulip,brainwane/zulip,synicalsyntax/zulip,punchagan/zulip,shubhamdhama/zulip,timabbott/zulip,timabbott/zulip,showell/zulip,zulip/zulip,brainwane/zulip,andersk/zulip,synicalsyntax/zulip,shubhamdhama/zulip,andersk/zulip,showell/zulip,kou/zulip,hackerkid/zulip,kou/zulip,zulip/zulip,synicalsyntax/zulip,shubhamdhama/zulip,punchagan/zulip,brainwane/zulip,punchagan/zulip,showell/zulip,showell/zulip,eeshangarg/zulip,zulip/zulip,showell/zulip,brainwane/zulip,eeshangarg/zulip,andersk/zulip,timabbott/zulip,shubhamdhama/zulip,timabbott/zulip,zulip/zulip,eeshangarg/zulip,zulip/zulip,zulip/zulip,showell/zulip,showell/zulip,andersk/zulip,rht/zulip,shubhamdhama/zulip,punchagan/zulip,timabbott/zulip,synicalsyntax/zulip,kou/zulip,synicalsyntax/zulip,rht/zulip,kou/zulip,hackerkid/zulip,kou/zulip,punchagan/zulip,eeshangarg/zulip,eeshangarg/zulip,andersk/zulip,hackerkid/zulip,eeshangarg/zulip