Update wording (#2999)

vector/src/main/res/values/strings.xml

@@ -1243,7 +1243,7 @@ Why choose Riot.im?
     <string name="keys_backup_setup_step1_manual_export">Manually export keys</string>
 
     <string name="keys_backup_setup_step2_text_title">Secure your backup with a Passphrase.</string>
-    <string name="keys_backup_setup_step2_text_description">We’ll store an encrypted copy of your keys on our server. Protect your backup with a passphrase to keep it secure.\n\nFor maximum security, this should be different from your account password.</string>
+    <string name="keys_backup_setup_step2_text_description">We’ll store an encrypted copy of your keys on your homeserver. Protect your backup with a passphrase to keep it secure.\n\nFor maximum security, this should be different from your account password.</string>
     <string name="keys_backup_setup_step2_button_title">Set Passphrase</string>
     <string name="keys_backup_setup_creating_backup">Creating Backup</string>
     <string name="keys_backup_setup_step1_recovery_key_alternative">Or, secure your backup with a Recovery Key, saving it somewhere safe.</string>
@@ -1265,7 +1265,7 @@ Why choose Riot.im?
     <string name="recovery_key">Recovery Key</string>
     <string name="unexpected_error">Unexpected error</string>
     <string name="keys_backup_setup_backup_started_title">Backup Started</string>
-    <string name="keys_backup_setup_backup_started_message">Your encryption keys are now being backed up in the background to your Homeserver. The initial backup could take several minutes.</string>
+    <string name="keys_backup_setup_backup_started_message">Your encryption keys are now being backed up in the background to your homeserver. The initial backup could take several minutes.</string>
 
 
     <string name="keys_backup_setup_skip_title">Are you sure?</string>