diff --git a/extension.json b/extension.json
index 9ac2f1c054..70040bb6d7 100644
--- a/extension.json
+++ b/extension.json
@@ -775,6 +775,8 @@
 				"visualeditor-pagetranslationwarning",
 				"visualeditor-recreate",
 				"visualeditor-redirect-description",
+				"visualeditor-loaderror-revidconflict",
+				"visualeditor-loaderror-wrongmode",
 				"visualeditor-saveerror",
 				"visualeditor-serializeerror"
 			],
diff --git a/i18n/ve-mw/en.json b/i18n/ve-mw/en.json
index 2d11b947a5..18a30879cf 100644
--- a/i18n/ve-mw/en.json
+++ b/i18n/ve-mw/en.json
@@ -389,6 +389,8 @@
 	"visualeditor-section-body-placeholder": "New section",
 	"visualeditor-section-title-placeholder": "Subject",
 	"visualeditor-serializeerror": "Error loading data from server: $1.",
+	"visualeditor-loaderror-revidconflict": "Revision IDs returned by the server do not match (document: $1, metadata: $2).",
+	"visualeditor-loaderror-wrongmode": "Tried to load the editor in wrong mode (data type: \"$1\", editor mode: \"$2\").",
 	"visualeditor-settings-tool": "Page settings",
 	"visualeditor-special-characters-group-other": "Often used",
 	"visualeditor-template-tools-definition.json": "null",
diff --git a/i18n/ve-mw/qqq.json b/i18n/ve-mw/qqq.json
index 80f70b858d..c03a664f70 100644
--- a/i18n/ve-mw/qqq.json
+++ b/i18n/ve-mw/qqq.json
@@ -407,6 +407,8 @@
 	"visualeditor-section-body-placeholder": "Placeholder for surface when adding a new section",
 	"visualeditor-section-title-placeholder": "Placeholder for title input when adding a new section\n{{Identical|Subject}}",
 	"visualeditor-serializeerror": "Text shown when the editor fails to load the wikitext for saving.\n\nParameters:\n* $1 is an error message, in English.",
+	"visualeditor-loaderror-revidconflict": "Error message shown when loading the editor.\n\nParameters:\n* $1 and $2: revision IDs, as numbers",
+	"visualeditor-loaderror-wrongmode": "Error message shown when loading the editor.\n\nParameters:\n* $1 and $2: names for editing modes (not translateable)",
 	"visualeditor-settings-tool": "Text of tool in the toolbar the lets users set specific page settings.\n{{Identical|Page settings}}",
 	"visualeditor-special-characters-group-other": "Label of the special character group shown if the wiki has visualeditor-quick-access-characters.json set up.",
 	"visualeditor-template-tools-definition.json": "{{ignored}}\n\nJSON object mapping context items to templates. See ve.ui.MWDefinedTransclusionContextItem.js.",
diff --git a/modules/ve-mw/init/targets/ve.init.mw.ArticleTarget.js b/modules/ve-mw/init/targets/ve.init.mw.ArticleTarget.js
index 3c7709ed54..24be8e6800 100644
--- a/modules/ve-mw/init/targets/ve.init.mw.ArticleTarget.js
+++ b/modules/ve-mw/init/targets/ve.init.mw.ArticleTarget.js
@@ -348,12 +348,13 @@ ve.init.mw.ArticleTarget.prototype.loadSuccess = function ( response ) {
 	if ( !data || typeof data.content !== 'string' ) {
 		this.loadFail( 've-api', { errors: [ {
 			code: 've-api',
-			html: 'No HTML content in response from server'
+			html: mw.message( 'api-clientside-error-invalidresponse' ).parse()
 		} ] } );
 	} else if ( response.veMode && response.veMode !== this.getDefaultMode() ) {
 		this.loadFail( 've-mode', { errors: [ {
 			code: 've-mode',
-			html: 'Tried to load "' + response.veMode + '" data into "' + this.getDefaultMode() + '" editor'
+			html: mw.message( 'visualeditor-loaderror-wrongmode',
+				response.veMode, this.getDefaultMode() ).parse()
 		} ] } );
 	} else {
 		this.track( 'trace.parseResponse.enter' );
@@ -403,7 +404,7 @@ ve.init.mw.ArticleTarget.prototype.parseMetadata = function ( response ) {
 	if ( !data ) {
 		this.loadFail( 've-api', { errors: [ {
 			code: 've-api',
-			html: 'No metadata content in response from server'
+			html: mw.message( 'api-clientside-error-invalidresponse' ).parse()
 		} ] } );
 		return false;
 	}
@@ -434,7 +435,8 @@ ve.init.mw.ArticleTarget.prototype.parseMetadata = function ( response ) {
 			// Retried already, just error the second time.
 			this.loadFail( 've-api', { errors: [ {
 				code: 've-api',
-				html: 'Revision IDs (doc=' + docRevId + ',api=' + this.revid + ') returned by server do not match'
+				html: mw.message( 'visualeditor-loaderror-revidconflict',
+					String( docRevId ), String( this.revid ) ).parse()
 			} ] } );
 		} else {
 			this.retriedRevIdConflict = true;