make i18n support for tost msgs

[todo]

EduJetPlayer/client/src/app/shared/classes/material.service.ts

Lines 4 to 7 in c821168

	// TODO: make i18n support for tost msgs
	export interface MaterialInstance {
	open?(): void;
	close?(): void;

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This issue was generated by todo based on a TODO comment in c821168. It's been assigned to @Blaud because they committed the code.