fix: update Shield copy and error messages for consistency

[hieu-w]

Description

Update Shield copy and error messages for consistency

Changelog

CHANGELOG entry:

Related issues

Fixes:

Manual testing steps

1. Go to this page...

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

---

Note

Standardizes Shield-related localization by using “MetaMask Transaction Shield,” lowercases the file uploader label, and refines plan detail wording in both en and en_GB.

• i18n (en, en_GB):
  • Branding consistency: Replace Transaction Shield with MetaMask Transaction Shield across coverage alert messages (high risk, chain not supported, paused, potential risks, signature not supported, tx type not supported, unknown).
  • Copy tweaks:
    • Update shieldClaimFileUploader label to Image upload (casing).
    • Revise shieldTxDetails1Description to “Secures assets on covered transactions.”

^{Written by Cursor Bugbot for commit d29d69b. This will update automatically on new commits. Configure here.}

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

Builds ready [d29d69b]

• builds: chrome, firefox
• builds (beta): chrome, firefox
• builds (flask): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• bundle size: Bundle Size Stats
• user-actions-benchmark: User Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
  • content-script: 0
  • offscreen: 0

UI Startup Metrics (1258 ± 98 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Standard Home	uiStartup	1258	1094	1487	98	1322	1430
			load	1091	947	1296	90	1173	1248
			domContentLoaded	1085	942	1288	89	1168	1241
			domInteractive	25	14	104	19	21	79
			firstPaint	609	99	1299	442	1085	1230
			backgroundConnect	233	220	253	7	237	245
			firstReactRender	28	20	77	7	29	40
			getState	22	8	76	11	26	43
			initialActions	1	0	3	1	1	2
			loadScripts	858	724	1055	89	938	1018
			setupStore	10	6	22	3	11	18
			numNetworkReqs	13	6	76	20	6	73
	Browserify	Power User Home	uiStartup	2227	1932	2772	239	2487	2772
			load	1142	947	1641	243	1478	1641
			domContentLoaded	1121	928	1620	241	1462	1620
			domInteractive	62	22	172	54	114	172
			firstPaint	896	272	1653	439	1045	1653
			backgroundConnect	222	204	240	11	234	240
			firstReactRender	77	45	108	19	93	108
			getState	260	195	367	50	289	367
			initialActions	1	0	4	1	2	4
			loadScripts	919	730	1402	235	1237	1402
			setupStore	31	15	55	12	41	55
			numNetworkReqs	124	94	202	37	167	202
	Webpack	Standard Home	uiStartup	854	729	1227	90	855	1094
			load	623	566	945	78	619	844
			domContentLoaded	615	561	924	74	612	815
			domInteractive	19	13	86	14	15	54
			firstPaint	191	63	899	177	205	601
			backgroundConnect	25	12	74	13	27	55
			firstReactRender	32	20	70	9	37	41
			getState	11	6	18	3	13	15
			initialActions	1	0	5	1	1	1
			loadScripts	612	559	913	72	610	805
			setupStore	12	6	35	4	13	18
			numNetworkReqs	13	6	73	19	6	71
	Webpack	Power User Home	uiStartup	1089	910	1651	258	1335	1651
			load	661	577	908	121	780	908
			domContentLoaded	644	571	858	109	752	858
			domInteractive	36	12	116	39	78	116
			firstPaint	380	63	862	288	600	862
			backgroundConnect	63	11	284	82	143	284
			firstReactRender	39	36	42	2	41	42
			getState	140	91	170	24	154	170
			initialActions	1	0	1	0	1	1
			loadScripts	640	569	848	105	741	848
			setupStore	11	7	27	7	8	27
			numNetworkReqs	84	64	132	27	129	132
Firefox	Browserify	Standard Home	uiStartup	1496	1343	2151	125	1530	1732
			load	1261	1146	1494	80	1302	1441
			domContentLoaded	1261	1146	1494	80	1302	1440
			domInteractive	57	33	175	36	56	155
			firstPaint	-	-	-	-	-	-
			backgroundConnect	41	26	136	16	49	72
			firstReactRender	29	23	56	7	29	48
			getState	11	7	44	6	11	23
			initialActions	2	0	3	1	2	3
			loadScripts	1236	1127	1477	78	1275	1405
			setupStore	13	7	64	9	12	33
			numNetworkReqs	12	6	62	15	7	55
	Browserify	Power User Home	uiStartup	3300	2534	4589	731	4282	4589
			load	1537	1308	2105	236	1810	2105
			domContentLoaded	1537	1308	2105	236	1809	2105
			domInteractive	245	74	569	168	449	569
			firstPaint	-	-	-	-	-	-
			backgroundConnect	671	92	1592	408	999	1592
			firstReactRender	79	60	138	18	83	138
			getState	191	112	388	73	242	388
			initialActions	2	2	4	1	3	4
			loadScripts	1482	1254	1887	213	1779	1887
			setupStore	67	23	185	39	90	185
			numNetworkReqs	127	78	234	60	226	234
	Webpack	Standard Home	uiStartup	1691	1507	2396	156	1715	2015
			load	1426	1261	1853	112	1462	1662
			domContentLoaded	1426	1259	1852	112	1462	1662
			domInteractive	56	30	164	28	62	126
			firstPaint	-	-	-	-	-	-
			backgroundConnect	53	26	181	26	60	115
			firstReactRender	34	25	89	9	37	47
			getState	17	7	162	20	13	54
			initialActions	2	0	3	1	2	2
			loadScripts	1393	1241	1741	101	1425	1627
			setupStore	18	7	197	24	14	62
			numNetworkReqs	13	6	69	16	8	63
	Webpack	Power User Home	uiStartup	3579	2865	4830	686	4519	4830
			load	1726	1502	2090	201	2003	2090
			domContentLoaded	1726	1502	2090	200	2002	2090
			domInteractive	252	98	557	174	512	557
			firstPaint	-	-	-	-	-	-
			backgroundConnect	656	141	1378	417	1009	1378
			firstReactRender	102	67	131	19	117	131
			getState	183	119	321	58	215	321
			initialActions	2	2	3	0	2	3
			loadScripts	1679	1475	2042	189	1931	2042
			setupStore	153	30	618	180	189	618
			numNetworkReqs	124	66	232	56	196	232

📊 Page Load Benchmark Results

Current Commit: d29d69b | Date: 11/14/2025

📄 Localhost MetaMask Test Dapp

Samples: 100

Summary

• pageLoadTime-> current mean value: 1.05s (±49ms) 🟡 | historical mean value: 1.03s ⬆️ (historical data)
• domContentLoaded-> current mean value: 734ms (±45ms) 🟢 | historical mean value: 718ms ⬆️ (historical data)
• firstContentfulPaint-> current mean value: 79ms (±17ms) 🟢 | historical mean value: 77ms ⬆️ (historical data)

📈 Detailed Results

Metric	Mean	Std Dev	Min	Max	P95	P99
pageLoadTime	1.05s	49ms	1.02s	1.42s	1.09s	1.42s
domContentLoaded	734ms	45ms	703ms	1.07s	762ms	1.07s
firstPaint	79ms	17ms	64ms	240ms	88ms	240ms
firstContentfulPaint	79ms	17ms	64ms	240ms	88ms	240ms
largestContentfulPaint	0ms	0ms	0ms	0ms	0ms	0ms

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 58 Bytes (0%)
• ui: 0 Bytes (0%)
• common: 75 Bytes (0%)