SAP offers a lot of texts/translations in their Terminology/Glossary database (also known as STERM). If you want to use the predefined translations from STERM in another tool (like the Weblate translation memory), you can simply create a CDS view and a report to export those translations.

CDS View

First off all you should create a CDS view which offers an easy access to the STERM data:

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@AbapCatalog.sqlViewName: 'ZCA_STERM_V'
@AbapCatalog.compiler.compareFilter: true
@AbapCatalog.preserveKey: true
@AccessControl.authorizationCheck: #CHECK
@EndUserText.label: 'Translations from STERM'
define view ZCA_STERM_TRANSLATION
  as select from sterm_ob_v as source
    inner join   sterm_ob_v as destination
      on  destination.concept    = source.concept
      and destination.object_typ = '' {
  source.langu as langu_source,
  source.text as text_source,
  source.text_uc as text_uc_source,
  destination.langu as langu_destination,
  destination.text as text_destination,
  count(*) as counter
}
where
      source.object_typ =  ''
  and source.langu      <> destination.langu
group by
  source.langu,
  source.text,
  source.text_uc,
  destination.langu,
  destination.text

Report

After that you can create a simple report to extract all translations from a source language to a destination language and export it as JSON:

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REPORT zexport_sterm.

PARAMETERS: p_slangu TYPE zca_sterm_v-langu_source OBLIGATORY DEFAULT 'EN',
            p_tlangu TYPE zca_sterm_v-langu_destination OBLIGATORY.

START-OF-SELECTION.
  PERFORM start.

FORM start.

  TYPES: BEGIN OF t_translation_memory,
           source          TYPE string,
           source_language TYPE string,
           target          TYPE string,
           target_language TYPE string,
           origin          TYPE string,
           category        TYPE i,
         END OF t_translation_memory.

  DATA: lt_export TYPE HASHED TABLE OF t_translation_memory
                  WITH UNIQUE KEY source source_language.

  " get all translations from the STERM tables
  SELECT *
    FROM zca_sterm_v
    INTO TABLE @DATA(lt_data)
    WHERE langu_source EQ @p_slangu
      AND langu_destination EQ @p_tlangu
      ORDER BY counter DESCENDING.

  LOOP AT lt_data INTO DATA(ls_data)
    GROUP BY ( langu_source = ls_data-langu_source
               text_source = ls_data-text_source ).

    DATA(ls_export) = VALUE t_translation_memory( ).

    CHECK ls_data-text_source IS NOT INITIAL AND ls_data-text_destination IS NOT INITIAL.

    ls_export-source_language = cl_i18n_languages=>sap1_to_sap2( ls_data-langu_source ).
    ls_export-source = ls_data-text_source.
    ls_export-target_language = cl_i18n_languages=>sap1_to_sap2( ls_data-langu_destination ).
    ls_export-target = ls_data-text_destination.
    ls_export-origin = space.
    ls_export-category = 1.

    INSERT ls_export
      INTO TABLE lt_export.

  ENDLOOP.

  IF lt_export IS INITIAL.
    RETURN.

  ENDIF.  

  " transform data to JSON
  DATA(lf_json) = /ui2/cl_json=>serialize( 
                    data = lt_export 
                    pretty_name = /ui2/cl_json=>pretty_mode-low_case ).

  TRY.
      DATA: lv_action TYPE i.
      DATA: lv_filename TYPE string.
      DATA: lv_fullpath TYPE string.
      DATA: lv_path TYPE string.
      DATA: lt_json TYPE TABLE OF string.

      " call save dialoag
      cl_gui_frontend_services=>file_save_dialog( 
        EXPORTING
          default_file_name = 'texts.json'
          default_extension = 'json'
          file_filter       = |JSON (*.json)\|*.json\|{ cl_gui_frontend_services=>filetype_all }|
        CHANGING
          filename          = lv_filename
          path              = lv_path
          fullpath          = lv_fullpath
          user_action       = lv_action ).

      IF lv_action EQ cl_gui_frontend_services=>action_ok.
        APPEND lf_json
          TO lt_json.


        " export file to local storage
        cl_gui_frontend_services=>gui_download( 
          EXPORTING
            filename     = lv_fullpath
            filetype     = 'ASC'
          CHANGING
            data_tab     =  lt_json ).

      ENDIF.
    CATCH cx_root INTO DATA(lo_text).
      MESSAGE lo_text->get_text( ) TYPE 'I'.
  ENDTRY.

ENDFORM.

Using this report allows you to easily export the best translation pairs (source <-> destination) to a local JSON file which can be imported into another tool of your choice.

If you need another export format (like XML, properties), you can easily adopt the report to produce the needed format.