- new `string-template` and `renderStringPref` (regex pattern matching) in chromium extension options
- new `cssInvertPage`, `cssInvertThumb`, and `cssInvertFilter` settings (with defaults; off by default)
- available filters: `brightness()`, `contrast()`, `grayscale()`, `invert()`, `sepia()`, `saturate()`, and `hue-rotate()` via regex (valid CSS syntax)
- translations for `en-US`, `en-GB`, `en-CA`, and `de`
- filter influences PDF view container and PDF thmbnail container (thus also custom text/drawings/highlights)
- new svg as icon (modified `toolbarButton-editorStamp.svg`)
- button toggle is added next to zoom/scale controls in the middle of the toolbar
- For the generic viewer we use @fluent/dom and @fluent/bundle
- For the builtin pdf viewer in Firefox, we set a localization url
and then we rely on document.l10n which is a DOMLocalization object.
With the removal of the (standalone) Firefox building code in PR 9566 (a year and a half ago), these files are now completely unused in the GitHub repository[1].
Hence it doesn't really seem necessary to keep fetching them with `gulp importl10n`, and the existing files in the `l10n` folder can also be removed (thanks to version control, they're easy enough to restore should the need ever arise).
The patch also allows an additional simplification, for the `gulp locale` and `gulp mozcentral` commands, since it's now possible to stop writing `l10n` files to the `extensions/firefox/` folder and instead just copy them similar to other build targets.
---
[1] They're obviously still used in `mozilla-central`, for fallback messages displayed through `PdfStreamConverter.jsm`, but that doesn't make it necessary to keep them *here* as far as I'm concerned.
With the removal of the (standalone) Firefox building code in PR 9566 (a year and a half ago), these files are now completely unused.
Hence it doesn't really make sense to keep building them as part of `gulp locale`, and the existing files in the `l10n` folder can also be removed (thanks to version control, they're easy enough to restore should the need ever arise).
