Added Russian Translations

Redo of the PR #598

**Added:**
- Russian Translations

**Fixed:**
- corrected .gitignore rules for default modules

(Reasoning behind change: when I added translation for `alert` module `git add` was telling me that `.gitignore` rule excludes files and folders under `modules/default`)

I also noticed that `.gitignore:56` has following declaration:

```
!/modules/node_helper
!/modules/node_helper/**
```
but I don't think this directory structure exists today (also there is a small typo)

translations/ru.json

@@ -0,0 +1,34 @@
+{
+	/* GENERAL */
+	"LOADING": "Загрузка …",
+
+	/* CALENDAR */
+	"TODAY": "Сегодня",
+	"TOMORROW": "Завтра",
+	"DAYAFTERTOMORROW": "Послезавтра",
+	"RUNNING": "Заканчивается через",
+	"EMPTY": "Нет предстоящих событий",
+
+	/* WEATHER */
+	"N": "С",
+	"NNE": "ССВ",
+	"NE": "СВ",
+	"ENE": "ВСВ",
+	"E": "В",
+	"ESE": "ВЮВ",
+	"SE": "ЮВ",
+	"SSE": "ЮЮВ",
+	"S": "Ю",
+	"SSW": "ЮЮЗ",
+	"SW": "ЮЗ",
+	"WSW": "ЗЮЗ",
+	"W": "З",
+	"WNW": "ЗСЗ",
+	"NW": "СЗ",
+	"NNW": "ССЗ",
+
+	/* UPDATE INFO */
+	"UPDATE_NOTIFICATION": "Есть обновление для MagicMirror².",
+	"UPDATE_NOTIFICATION_MODULE": "Есть обновление для MODULE_NAME модуля.",
+	"UPDATE_INFO": "Данная инсталляция позади BRANCH_NAME ветки на COMMIT_COUNT коммитов."
+}

translations/translations.js

@@ -26,4 +26,5 @@ var translations = {
 	"gr" : "translations/gr.json",  // Greek
 	"da" : "translations/da.json", // Danish
 	"tr" : "translations/tr.json", // Turkish
+	"ru" : "translations/ru.json", // Russian
 };