diff --git a/src/i18n/messages/ar.json b/src/i18n/messages/ar.json
index 88dabce2..65d61906 100644
--- a/src/i18n/messages/ar.json
+++ b/src/i18n/messages/ar.json
@@ -24,6 +24,8 @@
   "account.activation.error.message": "Something went wrong, please {supportLink} to resolve this issue.",
   "non.compliant.password.error": "{passwordComplaintRequirements} {lineBreak}Your current password does not meet the new security\n            requirements. We just sent a password-reset message to the email address associated with this account.\n            Thank you for helping us keep your data safe.",
   "login.inactive.user.error": "أنت بحاجة لتنشيط حسابك من أجل تسجيل الدخول {lineBreak}\n{lineBreak}لقد أرسلنا للتو رابط التفعيل إلى البريد الإلكتروني {email}. تحقق من مجلدات الرسائل غير المرغوب فيها أو {supportLink} إذا لم تستلم بريدًا إلكترونيًا.",
+  "login.reset.password.message.with.link": "If you've forgotten your password, click {resetLink} to reset.",
+  "login.locked.reset.password.message.with.link": "To be on the safe side, you can reset your password {resetLink} before you try again.",
   "sign.in.button": "Sign in",
   "need.help.signing.in.collapsible.menu": "Need help signing in?",
   "forgot.password.link": "Forgot my password",
@@ -54,6 +56,10 @@
   "login.rate.limit.reached.message": "Too many failed login attempts. Try again later.",
   "login.failure.header.title": "We couldn't sign you in.",
   "contact.support.link": "contact {platformName} Support",
+  "login.failed.link.text": "here",
+  "login.incorrect.credentials.error": "Email or password is incorrect.",
+  "login.failed.attempt.error": "You have {remainingAttempts} more sign-in attempts before your account is temporarily locked.",
+  "login.locked.out.error.message": "To protect your account, it’s been temporarily locked. Try again in {lockedOutPeriod} minutes.",
   "create.account.button": "Create Account",
   "already.have.an.edx.account": "Already have an edX account?",
   "sign.in.hyperlink": "Sign in.",
@@ -70,12 +76,19 @@
   "fullname.validation.message": "Please enter your Full Name.",
   "username.label": "Public Username (required)",
   "username.validation.message": "Please enter your Public Username.",
+  "username.format.validation.message": "Usernames can only contain letters (A-Z, a-z), numerals (0-9), underscores (_), and hyphens (-).",
+  "username.character.validation.message": "Your password must contain at least 1 letter.",
+  "username.number.validation.message": "Your password must contain at least 1 number.",
   "username.ratelimit.less.chars.message": "Public Username must have atleast 2 characters.",
   "country.validation.message": "Select your country or region of residence.",
   "support.education.research": "Support education research by providing additional information. (Optional)",
   "register.optional.label": "(optional)",
   "registration.request.server.error": "An error has occurred. Try refreshing the page, or check your Internet connection.",
   "registration.request.failure.header": "We couldn't create your account.",
+  "helptext.name": "This name will be used by any certificates that you earn.",
+  "helptext.username": "The name that will identify you in your courses. It cannot be changed later.",
+  "helptext.password": "Your password must contain at least 8 characters, including 1 letter & 1 number.",
+  "helptext.email": "This is what you will use to login.",
   "reset.password.request.invalid.token.description.message": "This password reset link is invalid. It may have been used already.\n            To reset your password, go to the {loginPasswordLink} page and select {forgotPassword}",
   "reset.password.page.heading": "Reset your password",
   "reset.password.page.instructions": "Enter and confirm your new password.",
diff --git a/src/i18n/messages/es_419.json b/src/i18n/messages/es_419.json
index 8c3f16da..062a81b8 100644
--- a/src/i18n/messages/es_419.json
+++ b/src/i18n/messages/es_419.json
@@ -24,6 +24,8 @@
   "account.activation.error.message": "Something went wrong, please {supportLink} to resolve this issue.",
   "non.compliant.password.error": "{passwordComplaintRequirements} {lineBreak}Your current password does not meet the new security\n            requirements. We just sent a password-reset message to the email address associated with this account.\n            Thank you for helping us keep your data safe.",
   "login.inactive.user.error": "In order to sign in, you need to activate your account.{lineBreak}\n            {lineBreak}We just sent an activation link to {email}. If you do not receive an email,\n            check your spam folders or {supportLink}.",
+  "login.reset.password.message.with.link": "If you've forgotten your password, click {resetLink} to reset.",
+  "login.locked.reset.password.message.with.link": "To be on the safe side, you can reset your password {resetLink} before you try again.",
   "sign.in.button": "Sign in",
   "need.help.signing.in.collapsible.menu": "Need help signing in?",
   "forgot.password.link": "Forgot my password",
@@ -54,6 +56,10 @@
   "login.rate.limit.reached.message": "Too many failed login attempts. Try again later.",
   "login.failure.header.title": "We couldn't sign you in.",
   "contact.support.link": "contact {platformName} Support",
+  "login.failed.link.text": "here",
+  "login.incorrect.credentials.error": "Email or password is incorrect.",
+  "login.failed.attempt.error": "You have {remainingAttempts} more sign-in attempts before your account is temporarily locked.",
+  "login.locked.out.error.message": "To protect your account, it’s been temporarily locked. Try again in {lockedOutPeriod} minutes.",
   "create.account.button": "Create Account",
   "already.have.an.edx.account": "Already have an edX account?",
   "sign.in.hyperlink": "Sign in.",
@@ -70,12 +76,19 @@
   "fullname.validation.message": "Please enter your Full Name.",
   "username.label": "Public Username (required)",
   "username.validation.message": "Please enter your Public Username.",
+  "username.format.validation.message": "Usernames can only contain letters (A-Z, a-z), numerals (0-9), underscores (_), and hyphens (-).",
+  "username.character.validation.message": "Your password must contain at least 1 letter.",
+  "username.number.validation.message": "Your password must contain at least 1 number.",
   "username.ratelimit.less.chars.message": "Public Username must have atleast 2 characters.",
   "country.validation.message": "Select your country or region of residence.",
   "support.education.research": "Support education research by providing additional information. (Optional)",
   "register.optional.label": "(optional)",
   "registration.request.server.error": "An error has occurred. Try refreshing the page, or check your Internet connection.",
   "registration.request.failure.header": "We couldn't create your account.",
+  "helptext.name": "This name will be used by any certificates that you earn.",
+  "helptext.username": "The name that will identify you in your courses. It cannot be changed later.",
+  "helptext.password": "Your password must contain at least 8 characters, including 1 letter & 1 number.",
+  "helptext.email": "This is what you will use to login.",
   "reset.password.request.invalid.token.description.message": "This password reset link is invalid. It may have been used already.\n            To reset your password, go to the {loginPasswordLink} page and select {forgotPassword}",
   "reset.password.page.heading": "Reset your password",
   "reset.password.page.instructions": "Enter and confirm your new password.",
diff --git a/src/i18n/messages/fr.json b/src/i18n/messages/fr.json
index e8e314ac..6cbb24c8 100644
--- a/src/i18n/messages/fr.json
+++ b/src/i18n/messages/fr.json
@@ -24,6 +24,8 @@
   "account.activation.error.message": "Something went wrong, please {supportLink} to resolve this issue.",
   "non.compliant.password.error": "{passwordComplaintRequirements} {lineBreak}Your current password does not meet the new security\n            requirements. We just sent a password-reset message to the email address associated with this account.\n            Thank you for helping us keep your data safe.",
   "login.inactive.user.error": "In order to sign in, you need to activate your account.{lineBreak}\n            {lineBreak}We just sent an activation link to {email}. If you do not receive an email,\n            check your spam folders or {supportLink}.",
+  "login.reset.password.message.with.link": "If you've forgotten your password, click {resetLink} to reset.",
+  "login.locked.reset.password.message.with.link": "To be on the safe side, you can reset your password {resetLink} before you try again.",
   "sign.in.button": "Sign in",
   "need.help.signing.in.collapsible.menu": "Need help signing in?",
   "forgot.password.link": "Forgot my password",
@@ -54,6 +56,10 @@
   "login.rate.limit.reached.message": "Too many failed login attempts. Try again later.",
   "login.failure.header.title": "We couldn't sign you in.",
   "contact.support.link": "contact {platformName} Support",
+  "login.failed.link.text": "here",
+  "login.incorrect.credentials.error": "Email or password is incorrect.",
+  "login.failed.attempt.error": "You have {remainingAttempts} more sign-in attempts before your account is temporarily locked.",
+  "login.locked.out.error.message": "To protect your account, it’s been temporarily locked. Try again in {lockedOutPeriod} minutes.",
   "create.account.button": "Create Account",
   "already.have.an.edx.account": "Already have an edX account?",
   "sign.in.hyperlink": "Sign in.",
@@ -70,12 +76,19 @@
   "fullname.validation.message": "Please enter your Full Name.",
   "username.label": "Public Username (required)",
   "username.validation.message": "Please enter your Public Username.",
+  "username.format.validation.message": "Usernames can only contain letters (A-Z, a-z), numerals (0-9), underscores (_), and hyphens (-).",
+  "username.character.validation.message": "Your password must contain at least 1 letter.",
+  "username.number.validation.message": "Your password must contain at least 1 number.",
   "username.ratelimit.less.chars.message": "Public Username must have atleast 2 characters.",
   "country.validation.message": "Select your country or region of residence.",
   "support.education.research": "Support education research by providing additional information. (Optional)",
   "register.optional.label": "(optional)",
   "registration.request.server.error": "An error has occurred. Try refreshing the page, or check your Internet connection.",
   "registration.request.failure.header": "We couldn't create your account.",
+  "helptext.name": "This name will be used by any certificates that you earn.",
+  "helptext.username": "The name that will identify you in your courses. It cannot be changed later.",
+  "helptext.password": "Your password must contain at least 8 characters, including 1 letter & 1 number.",
+  "helptext.email": "This is what you will use to login.",
   "reset.password.request.invalid.token.description.message": "This password reset link is invalid. It may have been used already.\n            To reset your password, go to the {loginPasswordLink} page and select {forgotPassword}",
   "reset.password.page.heading": "Reset your password",
   "reset.password.page.instructions": "Enter and confirm your new password.",
diff --git a/src/i18n/messages/zh_CN.json b/src/i18n/messages/zh_CN.json
index e8e314ac..6cbb24c8 100644
--- a/src/i18n/messages/zh_CN.json
+++ b/src/i18n/messages/zh_CN.json
@@ -24,6 +24,8 @@
   "account.activation.error.message": "Something went wrong, please {supportLink} to resolve this issue.",
   "non.compliant.password.error": "{passwordComplaintRequirements} {lineBreak}Your current password does not meet the new security\n            requirements. We just sent a password-reset message to the email address associated with this account.\n            Thank you for helping us keep your data safe.",
   "login.inactive.user.error": "In order to sign in, you need to activate your account.{lineBreak}\n            {lineBreak}We just sent an activation link to {email}. If you do not receive an email,\n            check your spam folders or {supportLink}.",
+  "login.reset.password.message.with.link": "If you've forgotten your password, click {resetLink} to reset.",
+  "login.locked.reset.password.message.with.link": "To be on the safe side, you can reset your password {resetLink} before you try again.",
   "sign.in.button": "Sign in",
   "need.help.signing.in.collapsible.menu": "Need help signing in?",
   "forgot.password.link": "Forgot my password",
@@ -54,6 +56,10 @@
   "login.rate.limit.reached.message": "Too many failed login attempts. Try again later.",
   "login.failure.header.title": "We couldn't sign you in.",
   "contact.support.link": "contact {platformName} Support",
+  "login.failed.link.text": "here",
+  "login.incorrect.credentials.error": "Email or password is incorrect.",
+  "login.failed.attempt.error": "You have {remainingAttempts} more sign-in attempts before your account is temporarily locked.",
+  "login.locked.out.error.message": "To protect your account, it’s been temporarily locked. Try again in {lockedOutPeriod} minutes.",
   "create.account.button": "Create Account",
   "already.have.an.edx.account": "Already have an edX account?",
   "sign.in.hyperlink": "Sign in.",
@@ -70,12 +76,19 @@
   "fullname.validation.message": "Please enter your Full Name.",
   "username.label": "Public Username (required)",
   "username.validation.message": "Please enter your Public Username.",
+  "username.format.validation.message": "Usernames can only contain letters (A-Z, a-z), numerals (0-9), underscores (_), and hyphens (-).",
+  "username.character.validation.message": "Your password must contain at least 1 letter.",
+  "username.number.validation.message": "Your password must contain at least 1 number.",
   "username.ratelimit.less.chars.message": "Public Username must have atleast 2 characters.",
   "country.validation.message": "Select your country or region of residence.",
   "support.education.research": "Support education research by providing additional information. (Optional)",
   "register.optional.label": "(optional)",
   "registration.request.server.error": "An error has occurred. Try refreshing the page, or check your Internet connection.",
   "registration.request.failure.header": "We couldn't create your account.",
+  "helptext.name": "This name will be used by any certificates that you earn.",
+  "helptext.username": "The name that will identify you in your courses. It cannot be changed later.",
+  "helptext.password": "Your password must contain at least 8 characters, including 1 letter & 1 number.",
+  "helptext.email": "This is what you will use to login.",
   "reset.password.request.invalid.token.description.message": "This password reset link is invalid. It may have been used already.\n            To reset your password, go to the {loginPasswordLink} page and select {forgotPassword}",
   "reset.password.page.heading": "Reset your password",
   "reset.password.page.instructions": "Enter and confirm your new password.",