PLF-5122: [Branding] i18n of Upload button and Preview title

Fix description:
* Add resource bundle for Upload button
* Replace the hard-coded labels by the corresponding resource bundle keys
PLF-5122: [Branding] i18n of Style options

Fix description:
	* Add resource bundle for Style options
	* Replace the hard-coded values by the corresponding resource bundle keys
Merge branch 'fix/4.0.x/PLF-5122' into stable/4.0.x
PLF-5134: i18n of Trial banner

Fix description:
* Define new resource bundle keys for these texts
* Use them inside Trial banner
PLF-5159 - Add Unified search and File Explorer pages into acme website