install from a hand-written oci-compose; Log2RAM journal fix

OCI manager Apps
- "Install an image that is not in the catalog" reads an oci-compose from a file of the host or from an address.
- A file written by hand states the image, its ports, variables and volumes, and what the installation asks; the rest is completed when it is read. A complete file, or the record of an installation, is installed as it is, and of a record only the template is used.
- Errors name the field they are in, also on a host without python3-jsonschema.
- oci/README.md describes the engine and the oci-compose block by block, with two examples in oci/examples/.
- The documentation page of the option covers it, in English and Spanish.

Log2RAM (reported by @f3rs3n)
- The sync removes the old active journal file from the disk copy, so a boot no longer restores it and journald deletes its oldest archives first. Log2RAM optimization 1.7; it takes effect from the next reboot.

Translations
- The bot keeps "oci-compose" as written.
- Spanish texts for the new option and for the Log2RAM notice.

scripts/post_install/auto_post_install.sh

@@ -887,6 +887,11 @@ _update_existing_log2ram_auto() {
         sed 's/rsync -aAXv /rsync -aXv --no-acls /g' "$log2ram_bin" | pmx_write_file "$log2ram_bin"
     fi
 
+    if pmx_log2ram_drop_stale_journal "$log2ram_bin"; then
+        NECESSARY_REBOOT=1
+        msg_ok "$(translate "Log2RAM keeps the journal in order from the next reboot")"
+    fi
+
     if dpkg-query -W -f='${Status}' proxmox-backup-server 2>/dev/null \
         | grep -q 'install ok installed'; then
         tmp_file="$(mktemp /etc/logrotate.d/.proxmox-backup-api.XXXXXX)" || return 1
@@ -995,7 +1000,7 @@ EOF
 
 
 install_log2ram_auto() {
-    local FUNC_VERSION="1.6"
+    local FUNC_VERSION="1.7"
     local existing_log2ram_bin=""
     pmx_journal_context "install_log2ram_auto" "$FUNC_VERSION"
 
@@ -1113,6 +1118,7 @@ install_log2ram_auto() {
             cp -a "$_l2r_bin" "${_l2r_bin}.proxmenux.bak"
             pmx_edit_file "$_l2r_bin" 's/rsync -aAXv /rsync -aXv --no-acls /g'
         fi
+        pmx_log2ram_drop_stale_journal "$_l2r_bin" || true
         break
     done