Fix placeholder replacement

[obulat]

Fixes

Fixes #340 by @sarayourfriend

Description

This PR fixes the bug in which only the first ###placeholder### in an ngx translated string was converted into the expected {placeholder} form. The fix was adding the g global flag to the regex expression.

Testing Instructions

First, to see the problem, you can checkout main branch, run npm i18n:get-translations, and search for ### in the locales folder. You will see that there are ### placeholders left in the json files.
Then, when you checkout this branch, run npm i18n:get-translations, and search for ### in the locales folder, you should see that these placeholders are only found in the pot files.
i18n:get-translations

Checklist

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[sarayourfriend]

LGTM! Glad it was relatively simple to fix 😁

[krysal]

Works great!