Add Lithuanian language to Tasmota

[zzdovydas]

Description:

This PR contains Lithuanian language file translated by native speaker. Additionally, configuration files were also changed to add LT language. The code compiles without warnings although further testing should be performed to identify if there are any issues.

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.8
• The code change is tested and works with Tasmota core ESP32 V.3.1.1.250203
• I accept the CLA.