Translations update from Hosted Weblate (#594)

* Translated using Weblate (Thai)

Currently translated at 71.1% (387 of 544 strings)

Co-authored-by: Nayuki <me@nayuki.cyou>
Translate-URL: https://hosted.weblate.org/projects/kotatsu/strings/th/
Translation: Kotatsu/Strings

* Translated using Weblate (Spanish)

Currently translated at 100.0% (546 of 546 strings)

Co-authored-by: gallegonovato <fran-carro@hotmail.es>
Translate-URL: https://hosted.weblate.org/projects/kotatsu/strings/es/
Translation: Kotatsu/Strings

* Translated using Weblate (Turkish)

Currently translated at 100.0% (546 of 546 strings)

Co-authored-by: Oğuz Ersen <oguz@ersen.moe>
Translate-URL: https://hosted.weblate.org/projects/kotatsu/strings/tr/
Translation: Kotatsu/Strings

* Translated using Weblate (Russian)

Currently translated at 99.8% (545 of 546 strings)

Co-authored-by: Hotarun <ihotarun@proton.me>
Translate-URL: https://hosted.weblate.org/projects/kotatsu/strings/ru/
Translation: Kotatsu/Strings

---------

Co-authored-by: Nayuki <me@nayuki.cyou>
Co-authored-by: gallegonovato <fran-carro@hotmail.es>
Co-authored-by: Oğuz Ersen <oguz@ersen.moe>
Co-authored-by: Hotarun <ihotarun@proton.me>

app/src/main/res/values-ru/strings.xml

@@ -540,4 +540,7 @@
     <string name="grayscale">Оттенки серого</string>
     <string name="disable_battery_optimization_summary_downloads">Может помочь с запуском загрузки, если у вас с этим возникают проблемы</string>
     <string name="sync_auth">Войти в аккаунт синхронизации</string>
+    <string name="welcome_text">Пожалуйста, выберите, какие источники вы хотите включить. Это можно изменить в настройках позже</string>
+    <string name="restore">Восстановить</string>
+    <string name="backup_date_">Дата резервного копирования: %s</string>
 </resources>