Implement database schema Migrator

This commit implements the new database schema Migrator which keeps
track of the on-disk schema and the schema used by the codebase. It
tries to makes future database schema upgrades user-friendlier.

2 files changed, 20 insertions, 0 deletions

diff --git a/theme/admin/lang/de.php b/theme/admin/lang/de.php
index 0a848a6..3c7e834 100644
--- a/theme/admin/lang/de.php
+++ b/theme/admin/lang/de.php
@@ -143,3 +143,13 @@ $LANGUAGE['markdown_code'] = 'Codeblock';
 $LANGUAGE['markdown_quote'] = 'Zitat';
 $LANGUAGE['markdown_list_ul'] = 'Liste [ungeordnet]';
 $LANGUAGE['markdown_list_ol'] = 'Liste [geordnet]';
+
+#===============================================================================
+# Migrations
+#===============================================================================
+$LANGUAGE['maintenance_mode'] = 'Wartungsmodus';
+$LANGUAGE['migration_upgrade'] = 'Eine Migration des Datenbankschemas ist erforderlich!<br>Die Datenbank verwendet die
+	Schema-Version <code>%d</code>, aber die Applikation benutzt die höhere Schema-Version <code>%d</code>.';
+$LANGUAGE['migration_notice'] = 'Die folgenden Kommandos migrieren das Datenbankschema von <code>%d</code> nach <code>%d</code>.';
+$LANGUAGE['migration_successful'] = 'Die folgenden Migrationen waren erfolgreich:';
+$LANGUAGE['migration_submit'] = 'Migrationen ausführen';
diff --git a/theme/admin/lang/en.php b/theme/admin/lang/en.php
index 174a1d7..20482d4 100644
--- a/theme/admin/lang/en.php
+++ b/theme/admin/lang/en.php
@@ -143,3 +143,13 @@ $LANGUAGE['markdown_code'] = 'Code block';
 $LANGUAGE['markdown_quote'] = 'Quote';
 $LANGUAGE['markdown_list_ul'] = 'List [unordered]';
 $LANGUAGE['markdown_list_ol'] = 'List [ordered]';
+
+#===============================================================================
+# Migrations
+#===============================================================================
+$LANGUAGE['maintenance_mode'] = 'Maintenance mode';
+$LANGUAGE['migration_upgrade'] = 'A database schema migration is required!<br>The on-disk schema version is
+	<code>%d</code> but the application uses the higher schema version <code>%d</code>.';
+$LANGUAGE['migration_notice'] = 'The following commands will migrate the database schema from <code>%d</code> to <code>%d</code>.';
+$LANGUAGE['migration_successful'] = 'The following migrations were successful:';
+$LANGUAGE['migration_submit'] = 'Run migrations';