i18n: Support translating mod description

[MattSturgeon]

Request

This topic was brought up in Crowdin discussions by Әлмәт Ак Арыслан
Әлмәт Ак Арыслан.

Hello! I think it would be nice to have a Possibility to translate Description and Summary for ModMenu... It really helps when navigating through Content of premade Modpacks and also it just improves Mod's Accessibility.

Implementation

While fabric.mod.json doesn't natively support translated descriptions, modmenu documents that additional keys can be added to our language files to handle this.

The additional keys are:

• modmenu.nameTranslation.freecam: mod name (probably doesn't need translating in our case?)
• modmenu.descriptionTranslation.freecam: full description shown in the right-hand pane
• modmenu.summaryTranslation.freecam: text shown in the mod list (defaults to description)

That may be more complex that it sounds, because we need a different description for the standard & Modrinth builds.

I suspect, we'll need to have the :metadata project generate lang files in addition to what it currently does.

This will mean moving the lang files out of common/src/resources and potentially adding additional lang files that we can merge when building.

We'll also need to move the description out of gradle.properties and into one of these new metadata language files.

Forge

I'm not aware of any way to include translations in mods.toml, nor am I aware of any other way to tell (neo)forge's mods menu about translations. That said, I've not properly looked into this yet.

Additional opportunities

Having a translation build step presents a couple unrelated opportunities:

• We can name our translations something Crowdin natively understands (e.g. en-US.json)
• We can split up our translations into smaller files (combining them during the build)
• We can use a different format (.properties supports comments and is easier to read than .json. Crowdin can use comments to add additional context.)
• We could simplify VariantTooltip, by doing most of the work at build time