[PM-38602] UI/UX inconsistency: login error message deviates from those of the other BW clients

### Steps To Reproduce

1. Go to the login screen.
2. Now, make sure that at least one of the next three things is incorrectly chosen/typed so that it results in a login error:
- Chose the server region (US, EU, self-hosted - valid or invalid)
- Enter your BW account email address. (valid or invalid)
- Enter your master password. (valid or invalid)

### Expected Result

The following error message was adjusted some time ago on most BW clients/apps. The mobile app should show the same error message (for UI/UX consistency).

(that "newer" error message of the other BW clients/apps says: "Invalid master password. Confirm your email is correct and your account was created on vault.bitwarden.eu." - of course the last part would be vault.bitwarden.com if you're trying to login on the ~~EU~~ US server region).

### Actual Result

The following error message is not consistent with the other BW clients/apps and was not adjusted accordingly. --> the UI/UX is inconsistent

(this "older" error message just says "Username or password is incorrect. Try again.")

### Screenshots or Videos

First, the **Android app's** current and UI/UX-inconsistent error message:

 

Current **web vault** (2026.5.0):

 

Current **desktop app** (2026.5.0 - Win 11):

 

Current **browser extension** (2026.5.1 - on Vivaldi/Win 11):

### Additional Context

Please check the iOS app's error message as well for UI/UX (in)consistency.

### Build Version

2026.4.2

### What server are you connecting to?

EU

### Self-host Server Version

_No response_

### Environment Details

© Bitwarden Inc. 2015-2026

Version: 2026.4.2 (21562)
📱 Fairphone FP5 🤖 15@35 📦 prod
🧱 commit: bitwarden/android/release/hotfix-v2026.4.1-bwpm@2e88a418a11a042fed230a0871cdcaa9bbff0c04
💻 build source: bitwarden/android/actions/runs/25866701011/attempts/1
🦀 SDK: 2.0.0-6825-release-hotfix-v2026.4.1-bwpm
🌩 Server: 2026.5.0 @ EU

### Issue Tracking Info

- [x] I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.