Add line reference comments to the POT file

[obulat]

Description

This PR adds the reference links to where the strings are located in the code to the POT file.

# hero.title 
#: https://github.com/WordPress/openverse-frontend/blob/main/src/components/HeroSection.vue#L6
msgctxt "hero.title"
msgid "Search for content to reuse"
msgstr ""

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[sarayourfriend]

This is so cool!

[zackkrida]

🤩 Works perfectly. The new .pot file looks correct, and there are no issues when a file reference can't be found for a string.