Prepare 4.21.0: the free tool first, translations and store notes

[andiwand]

Summary

The CI failure of #697. Only aSheetCellTakesAFill failed, and only in lite. The CI emulator is 320dp wide. The Pro badge and four toggles pushed the fill tool partly off screen, so Espresso refused the tap. On a 320dp screen, the old order fails with the same error, and the new order passes.

The fix is in the app, not in the test:

• A locked strip puts its free tool directly after the badge, so a small phone shows it. This also helps the highlighter in documents.
• The free tool shows its state in a locked strip, so a second tap takes the fill or the highlight off. Before, it always applied.
• The alignment row hides the empty color slot, so its icons are centered.
• A locked tool over a sheet offers Pro with a new message, pro_offer_sheet, that names the fill as the free tool.

Translations. Every language lacked 23 strings: the 8 from #697 and 15 older ones, including the three Pro offers. The diff adds 437 lines and removes none.

scripts/translate-app.py reads and writes only <string> elements, and it rewrites each file from the start. So it deleted the edit_cells_stale plurals from all 19 languages. The script now keeps the plurals blocks that a translation has. Its default review pass also reworded hundreds of existing translations. I did not keep those changes, and I took only the missing keys from its output.

Store notes. I wrote the English notes for 4.21.0 by hand, because the generated text left out cell formatting and alignment. store-copy.py translated them. All 15 locales are under 500 characters, and the longest is French, at 461. store-listing.py --version v4.21.0 passes.

Test plan

• spotlessCheck assembleDebug lintProDebug lintLiteDebug testProDebugUnitTest
• connectedProDebugAndroidTest and connectedLiteDebugAndroidTest: 98 of 98 each on Pixel_6_Pro (API 31)
• Lite MainActivityTests on a 320dp screen (wm density 720): 18 of 18
• By eye on the emulator: fill on and off in lite, the alignment row over a sheet (three choices) and over test.odt (four choices)

🤖 Generated with Claude Code