fix(build): escape quotes in translation texts

[ilhan007]

Background
The Translation Delivery pull request fails and I found out that one of the new texts in messagebundle_en.properties has has quoted word Drop files to upload them or use the "Upload" button .

Issue:
Later when building the i18n-defaults.js, the following fails:

// effectiveValue  has double quotes itself and a word inside with double quotes in addition
return `const ${key} = {key: "${key}", defaultText: "${effectiveValue}"};`;

Solution: escaping those quotes.