Add Open Graph metadata to the HTML5 editor
Add Open Graph metadata to the HTML5 editor

- Consistently use double quotes in the HTML markup.
- Define English language to assist screen readers and search engines.
- Add missing `alt` text for the logo image.
- Remove duplicate `id` for the preload project ZIP input.

firefly2442/godot,vkbsb/godot,Zylann/godot,akien-mga/godot,pkowal1982/godot,pkowal1982/godot,josempans/godot,Valentactive/godot,vnen/godot,MarianoGnu/godot,pkowal1982/godot,vnen/godot,firefly2442/godot,Valentactive/godot,vkbsb/godot,Shockblast/godot,DmitriySalnikov/godot,Valentactive/godot,Valentactive/godot,honix/godot,honix/godot,Valentactive/godot,akien-mga/godot,Faless/godot,Shockblast/godot,vnen/godot,vnen/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,firefly2442/godot,Faless/godot,vnen/godot,Valentactive/godot,pkowal1982/godot,BastiaanOlij/godot,MarianoGnu/godot,Shockblast/godot,DmitriySalnikov/godot,guilhermefelipecgs/godot,godotengine/godot,akien-mga/godot,akien-mga/godot,Zylann/godot,godotengine/godot,Valentactive/godot,Valentactive/godot,BastiaanOlij/godot,BastiaanOlij/godot,Faless/godot,DmitriySalnikov/godot,vkbsb/godot,Faless/godot,Zylann/godot,honix/godot,akien-mga/godot,sanikoyes/godot,sanikoyes/godot,MarianoGnu/godot,MarianoGnu/godot,vkbsb/godot,Shockblast/godot,godotengine/godot,godotengine/godot,Faless/godot,josempans/godot,Shockblast/godot,Faless/godot,pkowal1982/godot,guilhermefelipecgs/godot,Zylann/godot,firefly2442/godot,ZuBsPaCe/godot,sanikoyes/godot,MarianoGnu/godot,Faless/godot,MarianoGnu/godot,ZuBsPaCe/godot,josempans/godot,vkbsb/godot,josempans/godot,guilhermefelipecgs/godot,BastiaanOlij/godot,DmitriySalnikov/godot,vkbsb/godot,akien-mga/godot,DmitriySalnikov/godot,guilhermefelipecgs/godot,godotengine/godot,MarianoGnu/godot,godotengine/godot,DmitriySalnikov/godot,ZuBsPaCe/godot,DmitriySalnikov/godot,josempans/godot,godotengine/godot,Zylann/godot,honix/godot,ZuBsPaCe/godot,BastiaanOlij/godot,ZuBsPaCe/godot,honix/godot,Faless/godot,ZuBsPaCe/godot,sanikoyes/godot,sanikoyes/godot,MarianoGnu/godot,Zylann/godot,godotengine/godot,Zylann/godot,Shockblast/godot,sanikoyes/godot,pkowal1982/godot,pkowal1982/godot,firefly2442/godot,vnen/godot,guilhermefelipecgs/godot,Shockblast/godot,firefly2442/godot,firefly2442/godot,honix/godot,guilhermefelipecgs/godot,Shockblast/godot,vnen/godot,sanikoyes/godot,sanikoyes/godot,ZuBsPaCe/godot,akien-mga/godot,Zylann/godot,josempans/godot,josempans/godot,ZuBsPaCe/godot,pkowal1982/godot,BastiaanOlij/godot,firefly2442/godot,vnen/godot,josempans/godot,vkbsb/godot,vkbsb/godot,akien-mga/godot