Improve swap lang button for language and text swapping

[satti-hari-krishna-reddy]

fixes #469

Description :

This pull request addresses the issue where switching languages doesn't copy already provided input and output. With the modified changes now when the languages are swapped the new input is our already provided output.

before : https://beta.apertium.org/index.eng.html#?dir=eng-spa&q=Dog to https://beta.apertium.org/index.eng.html#?dir=spa-eng&q=Dog

After : https://beta.apertium.org/index.eng.html#?dir=eng-spa&q=Dog to https://beta.apertium.org/index.eng.html#?dir=spa-eng&q=Perro

Changes Made : -Lifted state from the child component TextTranslationForm to the parent component Translator, passing the state and its corresponding setter functions as props and wrapped setSrcText and setTgtText in the function swapLangText to swap the text and passed it to LanguageSelector as a prop. Included that function in swapLangs function to call it whenever it is executed.

-Modified TextTranslationForm.test to accommodate the new changes made to TextTranslationForm. In LanguageSelector.test, checked whether swapLangText is actually getting called or not.

[coveralls]

Pull Request Test Coverage Report for Build 7537945566

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 97.482%

---

Totals
Change from base Build 7484346259:	-0.2%
Covered Lines:	1380
Relevant Lines:	1398

---

💛 - Coveralls

[satti-hari-krishna-reddy]

@sushain97 , could you please review my pull request?

[sushain97]

This looks reasonable at first glance but I'll take a closer look tomorrow. I may have been wrong about the cleanest way to do this since I haven't looked at the code in a while. I appreciate the detailed PR description.

[satti-hari-krishna-reddy]

@sushain97 i moved swapLangs from src/components/translator/LanguageSelector.tsx to the src/components/translator/Translator.tsx and The swapping of languages and text is functioning as expected. However, this change has caused some issues in LanguageSelector.test.tsx. I made some adjustments to the test file to make it pass, but I think it might not be the optimal solution. Could you please take a look and help me on how to update the test accordingly?