Add schwa ə in Italian keyboard layout for inclusive language

[restuccia]

This pull request adds the schwa letter (ə) to the Italian keyboard layout, in the popup for the e key. The e key has been chosen to mimic the implementation of the Apple default iOS keyboard.

I am not sure whether the uppercase schwa (Ə) would be added automatically or whether an action is needed. Sadly, I cannot test the code

This would resolve #1274. The issue contains more information on inclusive language in Italian.

[Helium314]

Same as with other recent PRs modifying locale_key_texts: if it leads to user complaints / issues, I might decide to revert it.

Sadly, I cannot test the code

Why is that?

[restuccia]

Out of curiosity, what complaints or issues might this lead to?

Why is that?

I have no idea how to set up an Android development environment that works :\

[Helium314]

Out of curiosity, what complaints or issues might this lead to?

I've had multiple people creating issues because they wanted to remove "unnecessary" letter variants. (#1163 is a discussion, but similar)

I have no idea how to set up an Android development environment that works

Oh, you should be able to use GitHub actions to create a debug APK. Go to Actions -> Build Debug APK -> Run Workflow and then select the branch. A few minutes later you can download the result. Maybe you need to first enable workflows somewhere.
(no need for this PR though, I already tested and it works)

[restuccia]

I've had multiple people creating issues because they wanted to remove "unnecessary" letter variants. (#1163 is a discussion, but similar)

I see! This PR does not remove any letter, and follows the implementation of Gboard and Apple's iOS keyboard.

Oh, you should be able to use GitHub actions to create a debug APK. Go to Actions -> Build Debug APK -> Run Workflow and then select the branch. A few minutes later you can download the result. Maybe you need to first enable workflows somewhere. (no need for this PR though, I already tested and it works)

That's pretty amazing, thank you very much! Works as intended also for me