Russian translation of about page and remaining parts of p5.js

This pull request add Russian translation across various UI components of and other remaining parts of p5.js

Author: kishanchaubey23

client/i18n.js

@@ -11,6 +11,7 @@ import {
   it,
   ko,
   ptBR,
+  ru,
   de,
   frCA,
   zhCN,
@@ -36,6 +37,7 @@ export const availableLanguages = [
   'ja',
   'ko',
   'pt-BR',
+  'ru',
   'sv',
   'uk-UA',
   'zh-CN',
@@ -70,6 +72,7 @@ export function languageKeyToLabel(lang) {
     it: 'Italiano',
     ja: '日本語',
     ko: '한국어',
+    ru:'Russian',
     'pt-BR': 'Português do Brasil',
     sv: 'Svenska',
     'uk-UA': 'Українська',
@@ -93,6 +96,7 @@ export function languageKeyToDateLocale(lang) {
     ja,
     ko,
     'pt-BR': ptBR,
+    ru,
     sv,
     'uk-UA': uk,
     'zh-CN': zhCN,