Several buttons are not labeled properly

[PatchMixolydic]

Describe the bug
The ellipses menu, more buttons button, and exponentiation button do not have accessible labels, rendering them inaccessible to screen reader users. Also, some of the scientific buttons just use their visual label, causing them to be misread (eg. "ln" is announced as "lane" instead of "L N" or "natural log").

To Reproduce
Steps to reproduce the behavior:

1. Enable TalkBack
2. Open OpenCalc
3. Tap and hold, then drag around the calculator
4. Observe that some buttons are not labeled correctly

Expected behavior
These buttons should be labeled accurately.

Screenshots/videos
(I tried recording a video, but it didn't seem to pick up TalkBack ^^;)

Smartphone (please complete the following information):

• Device: Nokia XR21
• OS: Android 13 (Play system update 2023-11-01, security update 2023-12-05)
• App version: 3.0.0 beta 4
• Language: English (US) systemwide, English (UK) TTS

[inson1]

I think its feature request not a bug, OpenCalc doesnt yet support talkback, after its done its should be added to feature list

[inson1]

So we should add contentDescription attribute to all elements that dont work and add translations of those descriptions ( or maybe to all?)
https://developer.android.com/guide/topics/ui/accessibility/principles#label-elements
https://stackoverflow.com/questions/18516516/should-content-description-be-in-multiple-language

Imagebuttons dont work
sections dont work, because they use capitalized characters + I would add "section" to their name (in description)
DEG, RAD, INV dont work because they use capitalized characters

[Darkempire78]

Open a Pull request for this please