Fixing some hard-coded texts

[FutureYL3]

Description (Proposed Changes)

• improve expression of loading, weight and name from 加载, 重量, 名 to 加载中, 体重, 名称 to stick closer to Chinese expression habits
• fix hard-coded text overall change in widget MeasurementOverallChangeWidget, add relevent localization keys in app_en.arb and app_zh.arb
• fix hard-coded text in widget Indicator's text field, also add relevent localization keys in app_en.arb and app_zh.arb
• fix hard-coded text in widget PlanForm's DropdownMenu by adding a new method named getI18nLabel in widget forms to get localized labeltext
• add missing textPromptTitle and textPromptSubheading keys and theri values in app_zh.arb

some snapshots after fix:

Link to the issue :

• Link : #284

Tests

• Since no bugs fixed or feature added, no test cases are added.
• The localization made runs fine on my machine in Chinese environment.
• If there needs to be some kind of tests, please let me know.

Checklist

Please check that the PR fulfills all requirements listed below by checking the relevant checkboxes ([x]). This will ensure a smooth and quick review process.

• [x] Set a 100 character limit in your editor/IDE to avoid white space diffs in the PR
• [x] Tests for the changes have been added (for bug fixes / features)
• Since no bug fixes, no test has been added. The fixed localization works fine on my machine.
• [x] Added yourself to AUTHORS.md
• [x] Updated/added relevant documentation (doc comments with ///).
• add update logs to relevent descriptions in app_en.arb and app_zh.arb
• [x] Added relevant reviewers.

[rolandgeider]

Thanks!

[FutureYL3]

You're welcome!