Fix #4322: Stops Talkback from pronouncing asterisks.

[Ryggs]

Explanation

Fixes #4322

This PR stops talkback from pronouncing the word asterisks and instead pronounces the word required.

It introduces the usage of the helperText attribute and the removal of all occurrences of the *, in string files. The fields affected in the add profile activity layout file are name, pin, and confirm pin.

Essential Checklist

• The PR title and explanation each start with "Fix #bugnum: " (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• Any changes to scripts/assets files have their rationale included in the PR explanation.
• The PR follows the style guide.
• The PR does not contain any unnecessary code changes from Android Studio (reference).
• The PR is made from a branch that's not called "develop" and is up-to-date with "develop".
• The PR is assigned to the appropriate reviewers (reference).

For UI-specific PRs only

If your PR includes UI-related changes, then:

• Add screenshots for portrait/landscape for both a tablet & phone of the before & after UI changes
• For the screenshots above, include both English and pseudo-localized (RTL) screenshots (see RTL guide)
• Add a video showing the full UX flow with a screen reader enabled (see accessibility guide)
• Add a screenshot demonstrating that you ran affected Espresso tests locally & that they're passing

Demo

ORIGINAL WITHOUT TALKBACK

dev-no-talkback.mp4

ORIGINAL WITH TALKBACK

dev-with-talkback.webm

FIXED PR ISSUE WITHOUT TALKBACK

after-change-non-talkback.mp4

FIXED PR ISSUE WITH TALKBACK

after-change-talkback.mp4

Tests

[Ryggs]

@BenHenning, this duplicate causes breaks. But its present in the origin/develop. As seen here https://github.com/oppia/oppia-android/blob/develop/app/src/main/res/values/color_defs.xml

Build Error Image:

[BenHenning]

Hi @Ryggs. I took at the PR and left one follow-up comment.

Regarding the failure, it should go away if you sync to the latest develop. The PR that caused it has been reverted.

[BenHenning]

Sending this back to you @Ryggs per the comment above, and also converting it to be a draft PR since it's still a work-in-progress.

[BenHenning]

Thanks @Ryggs. Left a few follow-up comments, but this seems close to done. PTAL.

[BenHenning]

Thanks @Ryggs. Just a couple of follow-ups--PTAL.

[BenHenning]

Assigning @rt4914 since I think he can take a look at this now.

[rt4914]

I will review it today.

[rt4914]

Nice work @Ryggs Thanks.

[oppiabot]

Unassigning @rt4914 since they have already approved the PR.

[oppiabot]

Assigning @BenHenning for code owner reviews. Thanks!

[BenHenning]

Thanks @Ryggs. This LGTM!