Clarify that the account is a Matrix account

Now that auth flows can show a server name like `example.com` which might
delegate the HS to some other server, it could be confusing to see text like
"Sign in to example.com", especially if `example.com` runs an identity service,
uses SSO, has its own account system, or other things like this.

To clarify that we mean Matrix accounts, all auth flows are updated to talk in
terms of "<verb> your Matrix account on <server>".

Fixes part of
element-hq/element-web#8763 (comment).

src/components/structures/auth/ForgotPassword.js

@@ -236,15 +236,15 @@ module.exports = React.createClass({
             errorText = <div className="mx_Login_error">{ err }</div>;
         }
 
-        let yourMatrixAccountText = _t('Your account');
+        let yourMatrixAccountText = _t('Your Matrix account');
         if (this.state.enteredHsUrl === this.props.defaultHsUrl) {
-            yourMatrixAccountText = _t('Your account on %(serverName)s', {
+            yourMatrixAccountText = _t('Your Matrix account on %(serverName)s', {
                 serverName: this.props.defaultServerName,
             });
         } else {
             try {
                 const parsedHsUrl = new URL(this.state.enteredHsUrl);
-                yourMatrixAccountText = _t('Your account on %(serverName)s', {
+                yourMatrixAccountText = _t('Your Matrix account on %(serverName)s', {
                     serverName: parsedHsUrl.hostname,
                 });
             } catch (e) {

src/components/views/auth/PasswordLogin.js

@@ -253,15 +253,15 @@ class PasswordLogin extends React.Component {
             </span>;
         }
 
-        let signInToText = _t('Sign in');
+        let signInToText = _t('Sign in to your Matrix account');
         if (this.props.hsName) {
-            signInToText = _t('Sign in to %(serverName)s', {
+            signInToText = _t('Sign in to your Matrix account on %(serverName)s', {
                 serverName: this.props.hsName,
             });
         } else {
             try {
                 const parsedHsUrl = new URL(this.props.hsUrl);
-                signInToText = _t('Sign in to %(serverName)s', {
+                signInToText = _t('Sign in to your Matrix account on %(serverName)s', {
                     serverName: parsedHsUrl.hostname,
                 });
             } catch (e) {

src/components/views/auth/RegistrationForm.js

@@ -299,15 +299,15 @@ module.exports = React.createClass({
     },
 
     render: function() {
-        let yourMatrixAccountText = _t('Create your account');
+        let yourMatrixAccountText = _t('Create your Matrix account');
         if (this.props.hsName) {
-            yourMatrixAccountText = _t('Create your %(serverName)s account', {
+            yourMatrixAccountText = _t('Create your Matrix account on %(serverName)s', {
                 serverName: this.props.hsName,
             });
         } else {
             try {
                 const parsedHsUrl = new URL(this.props.hsUrl);
-                yourMatrixAccountText = _t('Create your %(serverName)s account', {
+                yourMatrixAccountText = _t('Create your Matrix account on %(serverName)s', {
                     serverName: parsedHsUrl.hostname,
                 });
             } catch (e) {

src/i18n/strings/en_EN.json

@@ -1252,13 +1252,14 @@
     "Username": "Username",
     "Mobile phone number": "Mobile phone number",
     "Not sure of your password? <a>Set a new one</a>": "Not sure of your password? <a>Set a new one</a>",
-    "Sign in to %(serverName)s": "Sign in to %(serverName)s",
+    "Sign in to your Matrix account": "Sign in to your Matrix account",
+    "Sign in to your Matrix account on %(serverName)s": "Sign in to your Matrix account on %(serverName)s",
     "Change": "Change",
     "Sign in with": "Sign in with",
     "Phone": "Phone",
     "If you don't specify an email address, you won't be able to reset your password. Are you sure?": "If you don't specify an email address, you won't be able to reset your password. Are you sure?",
-    "Create your account": "Create your account",
-    "Create your %(serverName)s account": "Create your %(serverName)s account",
+    "Create your Matrix account": "Create your Matrix account",
+    "Create your Matrix account on %(serverName)s": "Create your Matrix account on %(serverName)s",
     "Email": "Email",
     "Email (optional)": "Email (optional)",
     "Phone (optional)": "Phone (optional)",
@@ -1408,8 +1409,8 @@
     "A new password must be entered.": "A new password must be entered.",
     "New passwords must match each other.": "New passwords must match each other.",
     "Resetting password will currently reset any end-to-end encryption keys on all devices, making encrypted chat history unreadable, unless you first export your room keys and re-import them afterwards. In future this will be improved.": "Resetting password will currently reset any end-to-end encryption keys on all devices, making encrypted chat history unreadable, unless you first export your room keys and re-import them afterwards. In future this will be improved.",
-    "Your account": "Your account",
-    "Your account on %(serverName)s": "Your account on %(serverName)s",
+    "Your Matrix account": "Your Matrix account",
+    "Your Matrix account on %(serverName)s": "Your Matrix account on %(serverName)s",
     "The homeserver URL %(hsUrl)s doesn't seem to be valid URL. Please enter a valid URL including the protocol prefix.": "The homeserver URL %(hsUrl)s doesn't seem to be valid URL. Please enter a valid URL including the protocol prefix.",
     "A verification email will be sent to your inbox to confirm setting your new password.": "A verification email will be sent to your inbox to confirm setting your new password.",
     "Send Reset Email": "Send Reset Email",
@@ -1453,6 +1454,7 @@
     "A phone number is required to register on this homeserver.": "A phone number is required to register on this homeserver.",
     "You need to enter a username.": "You need to enter a username.",
     "An unknown error occurred.": "An unknown error occurred.",
+    "Create your account": "Create your account",
     "Commands": "Commands",
     "Results from DuckDuckGo": "Results from DuckDuckGo",
     "Emoji": "Emoji",